Prevalence of helmintic infections in Brazilian Maxakali indigenous: A repeated cross-sectional design

doi:10.21203/rs.3.rs-3084283/v1

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Prevalence of helmintic infections in Brazilian Maxakali indigenous: A repeated cross-sectional design

https://doi.org/10.21203/rs.3.rs-3084283/v1

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published 01 Feb, 2024

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Background

The prevalence of intestinal parasites is known to be high among Amerindian populations; further, there are serious problems in the healthcare of these populations in Brazil. The Maxakali, located in the northeastern region of Minas Gerais, Brazil, is an indigenous group that still preserves many of its cultural aspects. This study aimed to compare the positivity rate of schistosomiasis and soil-transmitted helminths in this ethnic group in epidemiological surveys conducted in 1972 and 2014.

Methods

Stool parasitological examinations were performed by the Kato-Katz technique during both periods in this population. In 2014, the parasitological diagnosis was also realized with the TF-Test® technique.

Results

In 1972, 270 inhabitants were examined. The positivity rates were 67.4% for Schistosoma mansoni, 72.9% for hookworms, 43.7% for Ascaris lumbricoides, and 23.7% for Trichuris trichiura. In 2014, 545 individuals were examined, and the positivity rates obtained were 45.7% for S. mansoni, 22.8% for hookworms, 0.6% for A. lumbricoides, and 2.8% for T. trichiura.

Conclusions

The comparison of the parasitological surveys conducted in 1972 and 2014, indicates that the indigenous Maxakali remained neglected by the health and indigenous protection authorities during these four decades. The infection rate observed in 2014 for schistosomiasis and hookworm remains high, considering the current epidemiological view of these diseases in the Brazilian population.

schistosomiasis

soil-transmitted helminths

Maxakali indigenous

Neglected Tropical Diseases

Infectious and parasitic diseases, often called neglected tropical diseases (NTDs) and caused by parasites and infectious agents, mainly affect socioeconomically disadvantaged populations, such as poor populations in Africa, Asia, and Latin America (Hotez, 2007; BRASIL, 2020; Feasey et al., 2010; Werneck et al., 2011; Andrade and Rocha, 2015). The main NTDs include soil-transmitted helminths, schistosomiasis, leishmaniasis, lymphatic filariasis, rabies, African trypanosomiasis, Chagas' disease, cysticercosis, onchocerciasis, trachoma, and echinococcosis (Hotez et al., 2014).

The highest prevalence of these diseases is in the tropical regions with the world's poorest populations; these diseases can lead to premature death, suffering, and disability in the long term (Feasey et al., 2010). It is estimated that millions of people are affected by these diseases; however, information on morbidity and disability related to them remains scarce (Noordende et al., 2016).

NTDs usually affect neglected populations in developing countries, where some individuals are more susceptible to parasitic infections and/or other transmissible diseases. These individuals include indigenous populations, ethnic minority communities, children, the elderly, and immunocompromised individuals (Ehrenberg and Ault, 2005).

Diseases caused by intestinal parasites rank high among major infections affecting the world's population. They are caused by helminths and protozoa, which lodge in different parts of the host's intestine, and may also impact other organs, such as the liver and lungs (Neves et al, 2016). These diseases result in high morbidity rates and serious health problems that can lead to learning and cognitive disorders (Castiñeiras and Martins, 2003). Intestinal parasitic infections are considered neglected diseases because they are not given due importance by government agencies (Holveck et al., 2007; Jaran, 2016). To prevent these diseases, it is imperative to improve socioeconomic conditions and hygiene; inculcate positive cultural habits; and implement basic sanitation and health education (Tavares-Dias and Grandinni, 1999).

Intestinal parasites are present throughout Brazil, mainly affecting children and socioeconomically disadvantaged communities; they continue to remain a serious public health problem in the country (Ferraz et al., 2014). Whereas the Brazilian health quality has improved over time (e.g., increased life expectancy and fewer deaths due to infectious diseases), the health quality of the indigenous population do not show significant improvement, using these parameters (Coimbra JR and Santos, 2001).

Intestinal parasitic diseases in Brazilian indigenous tribes are one of the primary elements in their epidemiological profile (Moura et al., 2010). The high prevalence of these diseases are indicative of inadequate sanitation and health infrastructure. These factors may be attributable to the Brazilian indigenous populations' contact with noindigenous locals society, which has led to a pronounced degree of social exclusion. To avoid diseases spreading over Amerindian populations, it is necessary to examine their habits, from their culture to living conditions, as well as the epidemiological profile of the diseases that affect these populations (Fontbonne et al., 2001).

This present study was developed with the Maxakali, an indigenous group in Minas Gerais State. With a total population of approximately 2,000 inhabitants, this ethnic group is found in Água Boa, in the municipality of Santa Helena de Minas; in Pradinho, in the municipality of Bertópolis; in Aldeia Verde, in the municipality of Ladainha; and in Aldeia Cachoerinha, Topázio District, municipality of Teófilo Otoni, in the northeastern region of Minas Gerais state (Estado de Minas Gerais, 2008).

The Maxakali group is marked by a history of high mortality rates, caused by malnutrition, alcoholism, homicides arising from internal conflicts, diarrheal diseases, scabies, and respiratory diseases (Assis et al., 2013). Amerindians of this ethnic group do not wash their hands and food before meals. They walk barefoot and cook over makeshift fires on a ground outside the house, using a single pot. Additionally, they deal with the presence of a large amount of feces around their dwellings, all of which engender the presence of parasitic diseases. Intestinal parasite infection is further exacerbated by the fact that they live in agglomerates, in houses with earthen floors, have few toilets, generally unused, and drink untreated, poor-quality water stored in buckets and pans (Assis et al., 2013).

The present study aimed to compare the prevalence of schistosomiasis mansoni and soil-transmitted helminths in the Maxakali group, through epidemiological surveys conducted in 1972 and 2014.

Area and period of the study

This study was carried out in two distinct periods, 1972 and 2014, in two groups of Maxakali living around Água Boa and Pradinho health centers. In 1972, the Maxakali population comprised 277 inhabitants; in 2014, this number increased to 1,546.

Stool examination

Parasitological diagnosis in the 1972 and 2014 surveys was carried out by using the Kato-Katz (KK) quantitative technique (Katz et al., 1972). In the last survey, the Helmtest® kit (Biomanguinhos, FIOCRUZ, Rio de Janeiro, RJ, Brazil) was used, according to the manufacturer's protocol. In 2014, one slide of each stool sample was examined, corresponding to 41.7mg of feces. The quantitative exam was performed for S. mansoni and the number of eggs per gram of feces (epg) was calculated by multiplying the number of eggs detected in each slide by the correction factor 24.

In 2014, the parasitological diagnosis was also made with the TF-Test®, a commercial technique that was also carried out under the manufacturer's recommendations (Bio-Brasil Biotecnologia, Anápolis, GO, Brazil); however, only one fecal sample was used. In short, a small portion of feces was added in a 10% formalin-containing tube, in which 3 mL of ethyl acetate and one drop of detergent were also added, and then centrifuged at 500 g for 1 min 30 seconds. The sediment generated during centrifugation was examined under an optical microscope in 10x and 40x increments to identify helminths (larvae and eggs) and protozoa (cysts), with three slides of each sample being analyzed.

Parasitological survey

In 2014, sterile specimen cups were provided to this population (n = 1546), of which 616 samples were returned, achieving a 39.8% adherence rate. The subjects in the study included those living in the above-mentioned villages, of both sexes, regardless of age, and those who agreed to participate in the study. Those who did not complete the two diagnostic tests were excluded. In the end, a total of 545 samples were analyzed: 296 (54.3%) females and 249 (45.7%) males.

Statistical analysis

The program GraphPad Prism version 5 built the graphical figures. Differences between proportions were tested by the Qui-square test of Pearson using the Epi Info 7.2.0.1. The significance level was defined by the p-value (p < 0.05).

Ethical considerations

In 1972, the study was conducted according to ethical principles determined by the 1964 Declaration of Helsinki. For the study performed in 2014, approval was obtained from the indigenous leaders and approved by the Research Ethics Committee of the Federal University of Ouro Preto (Opinion No. 2005/58), the National Commission for Research Ethics (CONEP, Opinion No. 902/2006) and the National Indian Foundation (FUNAI, Authorization No. 73/CGEP/06).

The demographic profile of the Maxakali indigenous population on the two epidemiological surveys is shown in Fig. 1. The distribution of individuals according to age demonstrates that the Maxakali group comprises mostly of early age population (0–10 years).

Figure 2 shows the positivity for helminths in both surveys. In the survey conducted in 1972, 270 subjects participated in the study, of which 67.4% were positive for S. mansoni, 72.9% for hookworm, 43.7% for A. lumbricoides, and 23.7% for T. trichiura. In 2014, the positivity rates for these parasites were 45.7%, 22.8%, 0.6% and 2.8%, respectively. Considering the Kato-Katz and TF-Test® combination (used only in the 2014 survey), results showed that of the 545 participants, 459 tested positive for at least one helminth (84.2%). The positivity for S. mansoni increased from 45.7–51.9%; for hookworm, from 22.8–59.3%; and for T. trichiura, from 2.8–3.9%. Positivity for S. mansoni using only the Kato-Katz technique was 45.7% and for only the TF-Test® technique, 33.2%. (p < 0.05). For hookworms, the highest rate was obtained using the TF-Test®, with a positivity of 46.8%, and with the Kato-Katz, the positivity was 22.8%. (p < 0.05). A. lumbricoides eggs (0.6%) were detected only by the Kato-Katz technique.

Figure 3 shows the positivity for S. mansoni according to the Kato-Katz technique by age group in both surveys. The results demonstrate that regardless of the age group, the positivity rates were higher in 1972 than in 2014, with greater differences in the age group from 0–10, and from 45– 60 and above. In the 1972 survey, the highest rates were observed in the 46–50 age group, followed by the 6–15 age group. Conversely, in the 2014 survey, the highest positivity rates were obtained for the 11–15 age group, decreasing with an increase in age. The peak in positivity in the 46–50 (100%) age group, observed in the 1972 survey, must be analyzed cautiously due to the low number of participants in these age groups.

The prevalence of intestinal parasites is one of the best indicators of a population's socioeconomic profile (Astal, 2004). Although there have been notable improvements in the quality of life in Brazil's population in the last decades, the prevalence of intestinal parasites in indigenous communities continues to remain high. This may be because the environment in which they live favors the development of such parasites. Such an environment includes heat and humidity, along with an absence of water and sewage treatment, as well as precarious socioeconomic conditions (Santos et al., 2010).

The indigenous Maxakali area, in the Mucuri valley, in the Northeastern region of Minas Gerais state, has environmental characteristics that engender the dissemination of parasites and the development of larval forms of soil-transmitted helminths (Assis et al., 2013; Crompton and Nesheim, 2002). It is also a plain region, with a lentic hydrographic basin and vertical or floating vegetation; this propitiates the development of the genus Biomphalaria sp, intermediate hosts of S. mansoni (Ministério da Saúde, 2014). A recent malacological survey found Biomphalaria snails in 79 out of 120 municipalities in Minas Gerais State (Carvalho et al., 2018). The species B. glabrata and B. straminea were found in the municipalities of Santa Helena de Minas and Bertópolis, respectively (where the Maxakali indigenous villages are located). However, the snails were not found infected with S. mansoni. It is worth noting that the positivity of the intermediate hosts in endemic areas are varied due to diagnostic techniques, the state of biological preservation, the time of examination, and the species of the snail (Caldeira et al., 2004). However, the hosts’ presence indicates a potential endemic area.

The high prevalence of intestinal parasitoses in indigenous lands occurs because they suffer social exclusion and sedentarization. Indigenous peoples live in restricted areas without basic sanitation, eat with unwashed hands, defecate in the soil, walk barefoot, bathe in natural waters (rivers and lakes), and do not have ways to conserve food, which facilitates infection by intestinal parasites (Escobar-Prado et al., 2010).

According to Assis et al. (2013), the Maxakali people have preserved their language and cultural habits, that facilitates parasite transmission. They live in houses made of mud, unfinished or covered with canvas, and have few toilets that are seldom used (only during village festivities). The villages are organized in familiar unit houses, with no water or sewage treatment; further, water is stored in unsuitable places (Assis et al., 2013).

According to information provided by the Special Indigenous Sanitary District (DSEI - MG/ES), considering the semi-nomadism of this population in the 2014–2019 period, the rate of latrines per household in the Água Boa and Pradinho health centers was 25% (30/119) and 4.6% (6/130) respectively, with no significant variation in the period. These data indicate a low level of sanitation and sewage infrastructure in the Maxakali indigenous land.

The Amerindian populations are among the most neglected, with a greater risk of social, economic, and cultural exclusion (Assis et al., 2013). Comparing the prevalence of helminths in the two epidemiological surveys (1972 and 2014) conducted with the Maxakali population in a gap of four decades, a decrease in the rates of positivity of helminths was observed; however, these rates remain high, from 67.4–45.7% for S. mansoni, and from 72.9–22.8% for hookworms. A sharp decrease was found regarding Ascaris and Trichuris, decreasing from 43.7% and 23.7–0.6% and 2.8%, respectively. This reduction may have been due to repeated anti-helminthic treatments carried out over years, which are safe, with low toxicity, low cost, and a single oral dose (Katz, 2018).

In 1972, the treatment for soil-transmitted helminths was conducted three times, with a six-month interval between each. Schistosomiasis treatment was administered annually to people with S. mansoni eggs in their feces, for two consecutive years. From 1975, one treatment was done by local health services, based on passive demand. In 2014, mass treatment was realized by health service, which may have contributed to the reduction of parasitic prevalence (Assis et al., 2013; Nacife et al., 2018).

The decrease in the prevalence of T. trichiura (from 23.7–2.8%) and A. lumbricoides (from 43.7–0.6%) may confirm the efficacy of chemotherapy, by using broad-spectrum antihelminthic, such as mebendazole and albendazole that are routinely used in Brazilian health services. In 1972, the treatment for soil-transmitted helminths was made three times, with a six-month interval between each. From 1975, the treatment was done by local health services.

Based on a study conducted on the prevalence of A. lumbricoides in an urban area of São Paulo (SP), Ferreira et al. (1991) stated, that areas with high demographic density, without adequate housing and sanitation, have a higher risk of infection than rural areas. In indigenous populations, the seminomandism of the inhabitants can explain the low prevalence of A. lumbricoides and T. trichiura observed in the present study. It is important to emphasize that no anthelminthic treatment was carried out in the study area with a defined periodicity in the most recent years, which justifies the high prevalence of the other helminths.

The risk of T. trichiura infection, despite being mainly environmentally influenced, also significantly involves genetic and household components, which may explain its low prevalence (Williams-Blangero et al., 2002; Ellis et al., 2007).

Regarding the reduction in the positivity of hookworms from 72.9% in 1972 to 22.8% in 2014, both obtained by the Kato-Katz technique, the rates may be underestimated. The hookworms’ egg structure starts to fade and eventually becomes invisible after a six-hour preparation in the slide (Katz, 2018). Considering the combination of both techniques (Kato-Katz and TF-Test®) used in the last survey, the positivity rate for hookworms increased to 59.3%, demonstrating that the infection by this parasite remained high in this ethnic group. The greater detection of hookworms by the TF-Test® may be due to the biological conservation of the samples with formaldehyde.

Soil characteristics in the Maxakali villages are also favorable for the development of the larval stages of soil-transmitted helminths (Assis et al., 2013; Crompton and Nesheim, 2002), which explains the prevalence of hookworm. Studies in other indigenous villages in Brazil also demonstrated the presence of these helminths. Coimbra-Jr and Mello (1981) obtained a prevalence of 43.3% for hookworms in the indigenous people of Suruí of the Aripuanã Park, in Rondônia state. Miranda et al. (1998), in a study conducted in the Parakanã indigenous community in the Pará state, found a prevalence of 33.3%.

S. mansoni also continues to present a high positivity rate. In 1972, the rate was 67.4%, which fell to 45.7% in 2014; both rates were obtained by the Kato-Katz technique. Despite being significant, the positivity rate remains high. The fact that the Maxakali are semi-nomadic (Assis et al., 2013), the presence of intermediate hosts in the region, frequent contact with potentially contaminated natural waters, cultural habits, and lack of basic sanitation, contribute to the persistence of schistosomiasis among this indigenous population (Katz, 2018; Martins-Melo et al, 2016). The low acceptance of treatment by the population further exacerbates the prevalence of schistosomiasis, explaining the higher positivity rate.

The Maxakali’s indigenous behavior of taking collective baths in natural water may further facilitate schistosomiasis infection. This is because this population shares the same water for different chores (baths, washing, cleaning, fishing); and because they use a characteristic instrument (called "puçá"), for fishing, which requires them to enter the aquatic environments (Assis et al., 2013).

In Brazil, three national surveys have already been conducted to assess the prevalence of schistosomiasis mansoni and two for soil-transmitted helminths. The first, between 1994 and 1953, was coordinated by Pellon and Teixeira (1950); the second (1975–1979), by the Special Program for Schistosomiasis Control – PECE – (Ministério da Saúde, 1976); and the third (2010/2015) called the National Survey on Prevalence of Schistosomiasis mansoni and soil-transmitted helminths (INPEG) by Katz (2018). In this last survey, it was possible to observe a sharp decrease in the prevalence of schistosomiasis and soil-transmitted helminths. In 11 endemic states for schistosomiasis, the positivity decreased from 10.09% in the first survey to 9.24% in the second and 1.79% in the most recent one. The PECE survey showed that in the region where the Maxakali are located, the prevalence was 14.5% for schistosomiasis. Regarding soil-transmitted helminths, in the Minas Gerais state, the positivity for these infections was 89.4% in the first survey, whereas in the last one, the positivity was 1.4% for ascariasis, 0.9% for hookworm, and 0.6% for trichuriasis.

These sharp reductions in the positivity rates of schistosomiasis and hookworm were not found in the indigenous Maxakali; however, the decrease of the prevalence of ascaridiasis and trichuriasis was similar to what has been observed in the state, indicating that this population needs greater attention, access to health, and better control strategies. Several factors, such as improvement in the sanitation conditions in the regions of the country and the specific treatment carried out in endemic areas, may have contributed to the decrease in the positivity rates of these parasite infections and the morbidity and mortality of schistosomiasis in Brazil (Katz, 2018).

The latest National Survey of Basic Sanitation (PNSB) conducted by the Brazilian Institute of Geography and Statistics in 2010 (IBGE, 2010), in agreement with the Cities Ministry in 2008, showed that in Minas Gerais state, all of its 853 municipalities presented some type of basic sanitation service (general water distribution network, sewage collection system, solid waste management and/or stormwater management). Considering the state water distribution network, all municipalities had access to this service; however, 8.1% did not receive treated water. Regarding the sewage collection system, 91.6% of the municipalities of the state had sewage collection systems, but only 22.7% treated the sewage. Nevertheless, this is not the reality on Maxakali indigenous lands, since the environmental and cultural aspects, inherent to this population, make it difficult to implement these sanitation actions. Moreover, they are neglected by the governmental authorities.

While there are significant findings, this study had some limitations, including the use of a single fecal sample per individual for the execution of the Kato-Katz (one slide) and TF-Test® techniques, which might have entailed a loss of sensitivity. This methodological decision was made to avoid logistic problems to carry out and conduct a study and due to the difficulty in working in the indigenous area. This limitation was partly compensated by the association of the TF-Test® with the Kato-Katz technique.

The data from this study indicate that infections by schistosomiasis and hookworm are still high, reflecting an urgent need for intervention by implementing prevention measures (health education) and control strategies, such as large-scale treatment associated with improved sanitary conditions through water supply, basic sanitation, and not walking barefoot. A comparison of the results of parasitological surveys indicates that the indigenous Maxakali ethnicity has remained neglected over the decades. Health and environmental authorities must act immediately to implement control measures aiming to improve the health situation of this population.

S. mansoni - Schistosoma mansoni

A. lumbricoides - Ascaris lumbricoides

T. trichiura - Trichuris trichiura

NTDs - neglected tropical diseases

KK - Kato-Katz quantitative technique

RJ – Rio de Janeiro

epg - eggs per gram of feces

FUNAI - National Indian Foundation

B. straminea - Biomphalaria straminea

DSEI - Special Indigenous Sanitary District

MG – Minas Gerais

ES – Espírito Santo

SP – São Paulo

PECE - Special Program for Schistosomiasis Control

INPEG - National Survey on Prevalence of Schistosomiasis mansoni and soil-transmitted helminths

PNSB - National Survey of Basic Sanitation

Ethics approval and consent to participate

Consent for publication

Not applicable

Availability of data and materials

Not applicable

Competing interests

The authors declare that there are no conflicts of interest.

Funding

The National Council for Scientific and Technological Development (CNPq), grant No 306467/2018-6; and the Foundation for Research Support in Minas Gerais (FAPEMIG), grant No PPM-00154-12.

Authors' contribution

MBPSLN: Conception and design of the study, Acquisition of data, Drafting the article. LMVS: Conception and design of the study, Analysis and interpretation of data, Drafting the article. KFB: Conception and design of the study, Acquisition of data. VNV: Conception and design of the study, Acquisition of data. CZM: Conception and design of the study, Acquisition of data. JCS: Conception and design of the study, Acquisition of data. FZ: Conception and design of the study, Acquisition of data, Analysis and interpretation of data. PMZC: Conception and design of the study. NK: Conception and design of the study, Acquisition of data, Analysis and interpretation of data. GLLMC: Conception and design of the study, Analysis and interpretation of data, Drafting the article. All authors read and approved the final manuscript

Acknowledgments

To Dr. José Pellegrino (in memoriam) coordinator of the Interdepartmental Research Group of Schistosomiasis, ICB, Federal University of Minas Gerais, until 1977, for your support. To Dr. Carlos Maurício Figueiredo Antune (in memoriam) and Dr Rafael Martins (in memoriam) as member of staff of the first and second data collected respectively. To the Maxakali indigenous population, for their receptivity and collaboration. We would like to thank Editage (www.editage.com) for English language editing.

Hotez P. A New Voice for the Poor. PLoS Negl Trop Dis. 2007;1:e77.
BRASIL. Ministério da Saúde. Doenças negligenciadas: estratégias do Ministério da Saúde. Rev Saúde Pública. 2020;44:200–2.
Feasey N, Wansbrough-Jones M, Mabey DCW, Solomon AW. Neglected tropical diseases. Br Med Bull. 2010;93:179–200.
Werneck GL, Hasselmann MH, Gouvêa TG. Panorama dos estudos sobre nutrição e doenças negligenciadas no Brasil. Ciênc saúde coletiva. 2011;16:39–62.
Andrade BLA, Rocha DG. Doenças negligenciadas e bioética: diálogo de um velho problema com uma nova área do conhecimento. Rev bioét. 2015;23:105–13.
Hotez PJ, Alvarado M, Basáñez MG, Bolliger I, Bourne R, Boussinesq M, et al. The Global Burden of Disease Study 2010: Interpretation and Implications for the Neglected Tropical Diseases. PLoS Negl Trop Dis. 2014;8:1–9.
Noordende AT, Kuiper H, Ramos JRNA, Mieras LF, Barbosa JC, Pessoa SMF, et al. Towards a toolkit for cross-neglected tropical disease morbidity and disability assessment. Int Health. 2016;8:71–81.
Ehrenberg JP, Ault SK. Neglected diseases of neglected populations: Thinking to reshape the determinants of health in Latin America and the Caribbean. BMC Public Health. 2005;5:1–13.
Neves DP, Melo AL, Linardi PM, Vitor RWA. Parasitologia Humana. 13^a ed. São Paulo: ATHENEU; 2016. 616 p.
Castiñeiras TMPP, Martins FSV. /Centro de Informações em Saúde para Viajantes – Cives. Universidade Federal do Rio de Janeiro. Centro de Ciências da Saúde. Departamento de Medicina Preventiva. Infecções por Helmintos e enteroprotozoários. Rio de Janeiro: 2003. Available from: http://www.cives.ufrj.br/informes/helmintos/hel-0ya.pdf.
Holveck JC, Ehrenberg JP, Ault SK, Rojas R, Vasquez J, Cerqueira MT. Prevention, control, and elimination of neglected diseases in the Americas: Pathways to integrated, inter-programatic, inter-sectorial action for health and development. BMC Public Health. 2007;7:1–21.
Jaran AS. Prevalence and seasonal variation of human intestinal parasites in patients attending hospital with abdominal symptoms in northern Jordan. East Mediterr Health J. 2016;22:756–60.
Tavares-Dias M, Grandinni AA. Prevalência e aspectos epidemiológicos de enteroparasitoses na população de São José da Bela Vista, São Paulo. Rev Soc Bras Med Trop. 1999;32:63–5.
Ferraz RRN, Barnabé AS, Porcy C, Júnior AD’E, Feitosa T, Figueiredo PM. Parasitoses intestinais e baixos índices de Gini em Macapá (AP) e Timon (MA), Brasil. Cad Saúde Colet. 2014;22:173–6.
Coimbra JRCEA, Santos RV. /Centro de Estudos em Saúde do Índio de Rondônia, Universidade Federal de Rondônia. Perfil Epidemiológico da População Indígena no Brasil: Considerações Gerais. Documento de Trabalho no. 3. Porto Velho: 2001. [cited 2001 March]. Available from: http://www.cesir.unir.br/pdfs/doc3.pdf.
Moura FT, Falavigna DLM, Mota LT, Toledo MJO. Enteroparasite contamination in peridomiciliar soils of two indigenous territories, State of Paraná, southern Brazil. Rev Panam Salud Publica. 2010;27:414–22.
Fontbonne A, Freese-De-Carvalho E, Acioli MD, Sá GA, Cesse EAP. Fatores de risco para poliparasitismo intestinal em uma comunidade indígena de Pernambuco, Brasil. Cad Saude Publica. 2001;17:367–73.
Estado de Minas Gerais. Marco de Referência. Secretaria de Estado de Planejamento e Gestão. Povos Indígenas em Minas Gerais: Minas Gerais [Internet]. Belo Horizonte: 2008. [cited 2009 December]. Available from: https://documents1.worldbank.org/curated/ar/259191468236979978/pdf/IPP3980SPANISH1Consolidado022012009.pdf.
Assis EM, Olivieria RC, Moreira LE, Pena JL, Rodrigues LC, Machado-Coelho GLL. Prevalência de parasitos intestinais na comunidade indígena Maxakali, Minas Gerais, Brasil, 2009. Cad Saude Publica. 2013;29:681–90.
Katz N, Chaves A, Pellegrino J. A Simple device for quantitative stool thick-smear technique in schistosomiasis mansoni. Rev Inst Med Trop São Paulo. 1972;14:397–400.
Astal Z. Epidemiological survey of the prevalence of parasites among children in Khan Younis governorate, Palestine. Parasitol Res. 2004;94:449–51.
Santos FS, Gama ASM, Fernandes AB, Reis Junior JDD, Guimarães J. Prevalência de enteroparasitismo em crianças de comunidades ribeirinhas do Município de Coari, no médio Solimões, Amazonas, Brasil. Rev Pan-Amaz Saude. 2010;1:23–8.
Crompton KDWT, Nesheim MC. Nutritional impact of intestinal helminthiasis during the human life cycle. Annu Rev Nutr. 2002;22:35–59.
Ministério da Saúde (MS). Secretaria de Vigilância em Saúde. Departamento de Vigilância Epidemiológica - Vigilância da Esquistossomose Mansoni: diretrizes técnicas. 4ª edição. Brasília: MS; 2014. p. 144.
Carvalho OS, Mendonça CLF, Marcelino JMR, Passos LKJ, Fernandez MA, Leal RS, et al. Distribuição geográfica dos hospedeiros intermediários do Schistosoma mansoni nos estados do Paraná, Minas Gerais, Bahia, Pernambuco e Rio Grande do Norte, 2012–2014. Epidemiol Serv Saude. 2018;27:1–9.
Caldeira RL, Jannotti-Passos LK, Lira PM, Carvalho OS. Diagnostic of Biomphalaria Snails and Schistosoma mansoni: DNA Obtained from Traces of Shell Organic Materials. Mem Inst Oswaldo Cruz. 2004;99:499–502.
Escobar-Prado ML, Godoy APO, Machado RS, Rodrigues D, Neto UF, Kawakami E. Prevalence of intestinal parasitoses in children at the Xingu Indian Reservation. J Pediat. 2010;86:493–6.
Katz N. Inquérito Nacional de Prevalência da Esquistossomose mansoni e Geo-helmintoses/Naftale Katz. 22^a ed. Belo Horizonte: CPqRR; 2018. 75 p. Available from: http://tabnet.datasus.gov.br/cgi/sinan/inpeg/RelatorioINPEG.pdf.
Nacife MBPSL, Siqueira LMV, Martins R, Vianna VN, Barbosa KF, Masioli CZ, et al. Prevalence of schistosomiasis mansoni in indigenous Maxakali villages, Minas Gerais, Brazil. Rev Inst Med Trop São Paulo. 2018;60:1–7.
Ferreira CS, Ferreira UM, Nogueira MR. Prevalência e intensidade de infecção por Ascaris lumbricoides em amostra populacional urbana (São Paulo, SP). Cad Saude Publica. 1991;7:82–9.
Williams-Blangero S, Mcgarvey ST, Subedi J, Wiest PM, Upadhayay RP, Rai DR, et al. Genetic component to susceptibility to Trichuris trichiura: evidence from two Asian populations. Genetic Epidemiol. 2002;22:254–64.
Ellis MK, Raso G, Li YS, Rong Z, Chen HG, Mcmanus DP. Familial aggregation of human susceptibility to co- and multiple helminth infections in a population from the Poyang Lake region, China. Int J Parasitol. 2007;37:1153–61.
Coimbra CEA Jr, Mello DA. Enteroparasitas e Capillaria sp. entre o grupo do Suruí, Parque Indígena Aripuanã, Rondônia. Mem Inst Oswaldo Cruz. 1981;76:299–302.
Miranda RA, Xavier FB, Menezes RC. Parasitismo intestinal em uma aldeia indígena Parakanã, sudeste do Estado do Pará, Brasil. Cad Saude Publica. 1998;14:507–11.
Martins-Melo FR, Ramos ANJR, Alencar CH, Heukelbach J. Mortality from neglected tropical diseases in Brazil, 2000–2011. Bull World Health Organ. 2016;94:103–10.
Pellon AB, Teixeira I. Distribuição da esquistossomose mansônica no Brasil. In: Congresso Brasileiro de Higiene, 8., Rio de Janeiro, Ministério da Educação e Saúde, Departamento Nacional de Saúde, 1950. (Trabalho da Divisão da Organização Sanitária). p.130.
MINISTÉRIO DA SAÚDE (MS). SUCAM. Programa Especial de Controle da Esquistossomose - Levantamento Nacional de Prevalência da esquistossomose mansoni, 1975–1979. Brasília: MS; 1976. p. 41.
Ministério do Planejamento., Orçamento e Gestão. Instituto Brasileiro de Geografia e Estatística (IBGE). Diretoria de Pesquisas Coordenação de População e Indicadores Sociais - Pesquisa Nacional de Saneamento Básico. Rio de Janeiro: IBGE; 2010. 219.

No competing interests reported.

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Prevalence of helmintic infections in Brazilian Maxakali indigenous: A repeated cross-sectional design

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Abstract

Background

Methods

Results

Conclusions

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BACKGROUND

METHODS

Area and period of the study

Stool examination

Parasitological survey

Statistical analysis

Ethical considerations

RESULTS

DISCUSSION

CONCLUSIONS

Abbreviations

Declarations

References

Additional Declarations

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Journal Publication

Version 1