1. Survey
A total of 3,990 emails containing links to the survey were sent, and 387 PCPs responded (response rate, 9.67%). Of these, 360 questionnaires were deemed suitable for analysis. The median length of professional experience was 25 years (P25: 15; P75: 31 years). Table 1 presents a breakdown of survey responses, comparing professional experience of < 15 years with ≥ 15 years.
In response to the question “Have you ever encountered suspected or confirmed cases of malaria in your practice?”, 32.8% responded affirmatively, with no significant differences based on years of professional experience. When asked to rate their knowledge of malaria, 57.6% described it as low, while 35.4% considered it moderate, with no notable variations based on length of experience. When prompted to answer the question “Which type of mosquito is responsible for transmitting malaria? (Aedes, Anopheles, or Culex)”, 89.5% correctly identified “Anopheles” regardless of experience.
Regarding travelers to malaria-endemic regions seen in clinical practice and the preventive measures taken with these patients, 45.6% of the PCPs indicated that they refer these individuals to preventive medicine units. Notably, 34.9% of physicians with fewer than 15 years of experience did so, compared to 48.8% of their more experienced colleagues (p = 0.07). Furthermore, 39.9% of physicians manage a portion of these travelers and refer the rest to preventive medicine units. In this case, those with fewer years of experience adopted this approach more frequently (48.8% vs. 37.2%) than their more veteran counterparts (p = 0.07). A mere 14.5% provide care for all such patients within their regular practice.
For the question “Which of these travelers (elderly, pregnant woman, child, or VFR) do you consider to be at the highest risk of contracting malaria?”, 51.6% selected VFRs, 34.9% answered pregnant women, 7.3% the elderly, and 6.3% children. There were no significant differences in terms of experience.
In response to a question concerning patients who return from a malaria-endemic area (i.e., “Which of the following symptoms (headache, diarrhea, fever, sweating, or all) do you consider most important?”), 76.5% identified all of them, while fever was the response given by 20.2%.
Regarding mosquito bite prevention, when asked “Which of the following measures do you consider most appropriate (mosquito nets, repellents, appropriate clothing, or are all of the above)?”, 97.7% stated that all were valid.
Responses to the question “What sources of information do you regularly consult?” revealed that 52.5% referred to guidelines from scientific societies, 28.5% consulted information from the Spanish Ministry of Health, 11% relied on scientific journals through PubMed, and 8.1% used Google or ChatGPT. There were no significant differences based on years of professional experience.
In response to the question “Which of these pieces of advice do you consider most suitable to give to a traveler visiting a malaria-endemic area?”, 69.2% recommended antimalarial prophylaxis. Younger professionals were less likely to provide this response than those with more experience (62.2% vs. 71.3%; p = 0.023). Additionally, 21.8% suggested using insect repellent as the primary preventive measure, with younger professionals choosing this option more often (32.2% vs. 18.6%; p = 0.023). A 6.0% minority advocated for vaccination, while 3.1% provided general advice on water and food. No differences were found when the data were analyzed in terms of years of experience; however, these responses are clearly incorrect.
When asked how malaria is diagnosed in their area, 42.5% stated that all available methods are used (i.e., thick blood smear, PCR, antigen tests). Interestingly, this response was more frequent among more experienced respondents (45.8% vs. 32.3%). Additionally, 41.4% selected the thick blood smear as the preferred diagnostic method, and more experienced physicians selected this option less frequently (39.0% vs. 48.2%; p = 0.043).
Table 1
Malaria survey responses among primary care physicians
Question
|
All
(N = 360)
|
< 15 years of professional practice
(N = 83)
|
≥ 15 years of professional practice
(N = 277)
|
P value
|
Have you had any suspected or confirmed cases of malaria in your practice?
|
|
|
|
|
No
|
260 (67.2)
|
61 (67.8)
|
199 (67.0)
|
0.891
|
Yes
|
127 (32.8)
|
29 (32.2)
|
88 (33.0)
|
How would you rate your knowledge of malaria? (n = 384)
|
|
|
|
|
High
|
22 (5.7)
|
4 (4.4)
|
18 (6.1)
|
0.837
|
Low
|
221 (57.6)
|
50 (55.6)
|
171 (58.2)
|
Medium
|
136 (35.49)
|
50 (55.6)
|
171 (58.2)
|
Null
|
5 (1.3)
|
1 (1.1)
|
4 (1.4)
|
Which of the following mosquitoes causes malaria?
|
|
|
|
|
Aedes
|
39 (10.1)
|
12 (13.3)
|
27 (9.2)
|
0.477
|
Anopheles
|
345 (89.5)
|
78 (86.7)
|
267 (90.5)
|
Culex
|
1 (0.3)
|
0 (0.0)
|
1 (0.3)
|
What is your course of action when travelers to malaria-endemic countries come to your practice?
|
|
|
|
|
I manage part and refer the rest to specialists.
|
151 (39.8)
|
42 (48.8)
|
109 (37.2)
|
0.070
|
I refer them to tropical medicine units.
|
173 (45.6)
|
30 (34.9)
|
143 (48.8)
|
I manage these patients in my regular practice.
|
55 (14.5)
|
14 (16.3)
|
41 (14.0)
|
Which of these travelers do you consider to be at the highest risk of contracting malaria?
|
|
|
|
|
Elderly
|
28 (7.3)
|
4 (84.4)
|
24 (8.2)
|
0.227
|
Pregnant
|
134 (34.9)
|
39 (43.3)
|
95 (32.3)
|
Child
|
24 (6.3)
|
5 (5.6)
|
19 (6.5)
|
VFR
|
198 (51.6)
|
42 (46.7)
|
156 (53.1)
|
When faced with a patient returning from a malaria-endemic area, which of the following symptoms do you consider most significant?
|
|
|
|
|
Headache
|
3 (0.8)
|
2 (2.29)
|
1 (0.3)
|
0.002
|
Diarrhea
|
8 (2.1)
|
5 (5.6)
|
3 (1.0)
|
Fever
|
78 (20.2)
|
17 (19.1)
|
61 (20.5)
|
All of the above
|
295 (76.5)
|
63 (70.8)
|
232 (78.1)
|
Regarding the prevention of mosquito bites, which of the following measures do you consider most appropriate?
|
|
|
|
|
Mosquito net
|
2 (0.5)
|
1 (1.1)
|
1 (0.3)
|
0.030
|
Repellents
|
5 (1.3)
|
0 (0.0)
|
5 (1.7)
|
Appropriate clothing
|
1 (0.5)
|
2 (2.2)
|
0 (0.0)
|
All the above are valid
|
376 (97.7)
|
86 (96.6)
|
290 (98.0)
|
What sources of information do you consult regularly?
|
|
|
|
|
Clinical guidelines of scientific societies
|
201 (52.5)
|
43 (47.8)
|
158 (53.9)
|
0.369
|
Spanish Ministry of Health
|
109 (28.5)
|
27 (30.0)
|
82 (28.0)
|
Scientific journals / PubMed
|
42 (11.0)
|
14 (15.6)
|
28 (9.6)
|
Search engines (e.g., Google) / generative artificial intelligence tools (e.g., ChatGPT)
|
31 (8.19)
|
6 (6.7)
|
25 (8.5)
|
Which of the following pieces of advice do you think is most appropriate to give to a traveler visiting a malaria-endemic area?
|
|
|
|
|
Antimalarial chemoprophylaxis
|
267 (69.2)
|
56 (62.2)
|
211 (71.3)
|
0.023
|
Use of insect repellent and appropriate clothing
|
84 (21.8)
|
29 (32.2)
|
55 (18.6)
|
Vaccination
|
23 (6.0)
|
2 (2.2)
|
21 (7.1)
|
General advice (e.g., water, food, sunscreen, travel insurance)
|
12 (3.19)
|
9 (3.0)
|
9 (3.0)
|
How is malaria diagnosed in your area?
|
|
|
|
|
Thick blood smear
|
148 (41.1)
|
40 (48.2)
|
108 (39.0)
|
0.541
|
Antigen test
|
10 (2.8)
|
1 (1.2)
|
9 (3.2)
|
Polymerase chain reaction (PCR)
|
49 (13.6)
|
16 (19.3)
|
33 (11.9)
|
All of the above
|
153 (42.5)
|
26 (31.3)
|
127 (45.8)
|
In the case of a patient returning from a tropical area with fever, diarrhea, and general malaise, what do you consider the most appropriate management?
|
|
|
|
|
Request full battery of laboratory tests and monitor general condition
|
225 (58.3)
|
53 (58.9)
|
172 (58.1)
|
0.041
|
Refer the patient to the emergency department to rule out malaria
|
158 (40.7)
|
37 (41.19)
|
120 (40.5)
|
Daily telephone monitoring
|
4 (1.0)
|
0 (0.0)
|
4 (1.4)
|
2. PCMR review
A total of 373 cases of malaria were diagnosed from 2005 to 2022. The average yearly number of diagnosed cases exceeds 20, with a notable decline in 2020 and 2021 due to the pandemic and related travel restrictions (Fig. 1).
Among the 253 patients with a PCMR who were subsequently diagnosed with malaria in the course of a hospital visit, a specific malaria episode was entered in the PCMR for 102 individuals (40.3%).
An examination of malaria cases by basic healthcare area (geolocation of their assigned primary care facility) allowed us to create an incidence map of cases (Fig. 2).
Figure 2. A) Map of malaria incidence per 1000 inhabitants in a health area in the Madrid region by primary care center. B) Health area population and cases
Other African countries: Congo (n=5), Ivory Coast (n=2), Senegal (n=2), Benin (n=1), Cameroon (n=1), Chad (n=1), Guinea (n=1), Sierra Leone (n=1), Sudan (n=1). Other European countries: France (n=1), Netherlands (n=1), Poland (n=1), UK (n=1). The Americas: Guyana (n=1),
Finally, we analyzed records of drugs prescribed for malaria chemoprophylaxis (at any date/time) within the primary care history of patients who had a prior primary care record. Additionally, we examined entries concerning 3 vaccines (hepatitis A, hepatitis B, and typhoid fever) recommended for individuals traveling to high-risk countries. The results are presented in Table 3.