Published data concerning secondary bacterial BSI in ICU patients with COVID-19 are limited. In this study we found 16.7% overall prevalence of BSIs in admitted COVID-19 ICU [Fig. 1] of which 3.6% were had candidemia and 96.3% were had bacteremia. In gender wise distribution 59.2% were male and BSIs in 48.1% while 40.7% female and BSIs in 44%( Fig.1). Naveenraj et al [2021] reported 8.5% BSIs in ICU COVID-19 patients from western part of India (3). Vijay et al [2021] reported 3.6% secondary infection in COVID-19 patients (17) including hospital acquired as well as community acquired infections. Khurana et al [2021] reported a 15% of severe illness in COVID-19 admitted in ICUs and secondary infections with resistant pathogens in COVID-19 patients (18) and overall resistance ranged from 9% to 84% amongst all organisms. In the present study; of 193 BSIs a substantial majority of patients had acute respiratory distress syndrome (ARDS) 81(41.9%) while chronic obstructive pulmonary disease (COPD) was in 46 (23.8%) patients.
In the present study comorbidities are the main underlying aetiologies collectively ranging from 18% to 87.5% of cases [Table No. 1]. Predominantly 55.3% ARDS, 49.6% for COPD, 45.3% for diabetes, 42.3% for hypertension,
Published investigation reports correlated to the impact of long-term conditions on COVID-19 has persistent on single comorbidities. Nevertheless, one-third of adults worldwide are projected to have two or more long-term conditions, increasing to more than two-thirds in those aged 65 or older. Arawal et al Uk [2022] reported around 58% of patients admitted to the hospital due to COVID-19 had multimorbidity (19). From a health-facilities viewpoint, clinically managing of patients with multimorbidity is frequently complicated. Multimorbidity be capable of strengthen the threat of destruction occurring through clinical intrusions. Elder age and underlying diseases have been noted as the main factors for vulnerability to COVID-19. An age ≥60 years is a major a risk factor (18,20). In the present study, admission in ICU for COVID-19 were highest in elder patients followed by adults. Age wise distribution amongst the COVID-19 patients admitted in ICU showed that patient from age 18 to 30 were 7.3% , age 31 to 40 were 10.1% , age 41 to 50 were 12.4%, age 51 to 60 were 15.9%, age 61 to 70 were 22.9% and age more than 70 were 31.1% [Fig.2]. Aging worsening of health-related issues to vital organs due to alter in functioning of pulmonary physiology, pathology during ling infections. which affects responsiveness and tolerance in older patients (21, 22). Overproduction of interleukin-6 (IL-6) in the brain in older age and increased expression of voltage-activated K+ channels, possibly increasing IL-6 production and neuroinflammation. Due to altered immune function through ion signalling can have profound impacts on the enhanced vulnerability to COVID-19 infection.
In the present study, further possible comorbidity were ischemic heart diseases [23.8%], chronic lung disease [15.6%], chronic renal failure 33.15%, Chronic liver disease [11.5%], Autoimmune [8.4%], malignancy [12%], multi-organ failure [15%] were reported. In this report we found significantly that infection related to invasive devices (IRDI) favoured in increasing complications in ICU COVID-19 patients [Table 1]. In this study we observed BSIs related to invasive devices in COVID-19 ICU patients such as arterial line [88%], foleys catheter [86%], endotracheal intubation [69.4%] and central venous line [49.7%] were recorded [Table 1]. Other risk factors include poor nutrition, dementia, dehydration, and various clinical complications, especially in frail and bedridden patients. A lack of a timely diagnosis and therapeutic and preventive measures increases the risk of a severe infection. Restricted physical inactivity and produced social isolation-associated stress. These aspects may possibly added worsen the health of older people, causing to harmful health effects.
Diabetic patients have increased morbidity and mortality rates and have been linked to more hospitalization and intensive care unit (ICU) admissions [1]. patients with chronic obstructive pulmonary disease (COPD) or any respiratory illnesses are also at higher risk for severe illness from COVID-19 [2]. The risk of contracting COVID-19 in patients with COPD is found to be 4-fold higher than patients without COPD [2]. Generally, COVID-19 patients died due to the multiple organ failure. Clinical manifestations were reportedly more severe, and the disease course was more sustained in the aged, which necessitated rigorous medical supervision and interventions [23,24].
In the present study we found significantly predominant isolation of gram-negative clinical pathogen (GNCP)causing BSIs. Of the total (149/193(77%)) pathogens were GNCP and (43/193(22%)) pathogens were gram positive clinical pathogen (GPCP) followed by 15(7%) Candida spp. Isolation. [Table 2] Nearly in 12(6.2%) cases of BSIs polymicrobial flora has been recorded. Related finding was described by Naveenraj P et al and Vijay S et al [3,17]. However, Giacobbe DR et al and Elabbadi A et al reported GPCP as predominant clinical pathogen causing BSIs in COVID-19 [5,25]. In the present study we found 7% candidemia and similar findings were reported by Kayaaslan B et al (Turkey), Vinayagamoorthy K et al (India) and Nucci M et al (Brazil) [26-28].
We observed that in our analysis candidemia might developed in patients before admission in ICU and or before hospitalization. As non-occupancy of bed in severe pandemic might worsen the situation. Higher mortality has been observed in Corticosteroid consumption, incidence of sepsis and older age were foremost risk factors. Candidemia with high mortality rates should always be kept in mind throughout the follow-up of ICU patients, even in the initial period. In the present study we observed the reasonably high percentage of Klebsiella pneumoniae 53(27.4%) and Acinetobacter baumanii 39(20.2%) followed by E. coli 27 (13.9%) and majority were MDRO [Table 2].
Overall, 100% susceptibility was observed to tobramycin by E. coli GNCP and highest resistance was ceftazidime (70%) by Enterobacter spp. Among all pathogens, the highest resistance for Klebsiella pneumoniae was observed with ciprofloxacin (57%), aztreonam (53%) cefepime (54%), followed by ceftriaxone (52%) ceftazidime (49%) and meropenem (21%) [Figure 3]. In the present study 81(54.3%) of MDRO infections recognized were CRAB, ESBL of which 60 strains were class A CARB ESBL predominantly by Acinetobacter baumanii and Klebsiella pneumonaie, 45strains were Class B MBL predominantly be Citrobacter spp. and Acinetobacter baumanii, 31 strains were class C AmpC predominantly by E. coli and Enterobacter spp. and 27 strains were class D OXA predominantly by Acinetobacter baumanii and Klebsiella pneumoniae and Pseudomonas aeruginosa . 9 strains were MRSA of which 5 strains were MLSBi phenotype and 4 Enterococcus spp. were HLGR [Figure 4]. In the present study the high impact of COVID-19 on BSIs caused by MDRO GNCP in ICU have been observed. Cogliati Dezza F et al, Pascale R et al and Segala Fv et al reported similar findings [29-31]
Throughout the COVID-19 pandemic, several factors could have responsible for the emergence and spread of multidrug resistance in hospitals as well as in community. These included excessive burden in hospitalised patients specially in ICUs and uncontrolled panic situations in hospital settings created to patient-to-patient transmission. The misuse and or overuse of antibiotics for suspected BSIs might moreover have contributed to the emergence and spread of antimicrobial resistance. Almost all patients included in this study received corticosteroids and immunosuppressants along with broad spectrum antibiotics. Conclusively, the probable delay in presenting culture and sensitivities results from the microbiology laboratories due to the COVID-19 overload may have influenced to improper antibiotic treatment.
Limitation of the study: Due to overload of detection and confirmation of COVID-19 cases; our study could not be extended for genotypic characterization of ESBL, MBL and CARB which would have given insight on dissemination of MDR strains.
Antimicrobial resistance was one of our greatest public health concerns prior to the COVID-19 pandemic, and it remains so