Washington [US], December 9 (ANI): The high levels of arsenic contamination in drinking water, compared to areas with less contamination, have a higher prevalence of antibiotic-resistant Escherichia coli in both water and child stool samples.
The study was published in the journal, 'PLOS Pathogens'.
Antibiotic resistance is one of the leading causes of death and hospitalization worldwide. While the major drivers of antibiotic resistance are the overuse and misuse of antibiotics, natural elements such as heavy metals can also promote antibiotic resistance.
In the new study, researchers collected water and stool samples from both mothers and young children of 100 families in two rural subdistricts in Bangladesh. Families in the Hajiganj subdistrict use drinking water from shallow tube wells, which have a high concentration of arsenic, while Matlab families collect their drinking water from arsenic-free deep tube wells.
The median arsenic concentration in the 50 water samples from Hajiganj was 481 mg/L while the median arsenic concentration in the 50 water samples from Matlab was 0 mg/L. Overall, 84 per cent of all water and stool samples across both sites were found to be positive for E. coli. Prevalence of antibiotic-resistant E. coli was significantly higher in water in Hajiganj (48 per cent) compared to water in Matlab (22 per cent, p<0.05) and among children in Hajiganj (94 per cent) compared to children in Matlab (76 per cent, p<0.05), but not among mothers. Moreover, a higher proportion of E. coli from Hajiganj were resistant to multiple antibiotics, including penicillin, cephalosporin, and chloramphenicol.
"The positive association detected between arsenic exposure and antibiotic resistance carriage among children in arsenic-affected areas in Bangladesh is an important public health concern that warrants redoubling efforts to reduce arsenic exposure," the authors say.
Dr Islam adds, "Heavy metals such as arsenic are more stable than antibiotics in the environment, and they continue to exert selective pressure on bacteria over a more extended period driving the evolution and expansion of antimicrobial resistance in the community. The extent to which this phenomenon drives the observed higher rates of antimicrobial resistance, as opposed to other confounders, would benefit from the further study; nevertheless, it is critical to contain this environmental driver of antimicrobial resistance along with responsible antimicrobial usage in medicine and agriculture." (ANI)