In some rivers the concentrations of antibiotics just rolls over.
Canadian researchers from York University conducted a global monitoring of the world rivers and found in them a critical content of various antibiotics. The results of the study, the researchers told a conference of the Society of toxicology and environmental chemistry in Helsinki (Finland).
The study of rivers was held on six continents in 72 countries. We studied the quantity contained in the water 14 of the most common antibiotics. It turned out that in some rivers their concentration exceeds the norm more than 300 times.
The most dangerous antibiotic in the study group was metronidazole is used to treat bacterial infections. Its concentration often exceeded the permissible level in different rivers, and in a river in Bangladesh, the norm was exceeded 300 times.
Often in different rivers met the antibiotic trimethoprim (to treat a urinary tract infection). Most allowable concentration exceeded the antibiotic ciprofloxacin (treats bacterial infections).
The researchers noted in their report that most of the critical concentration of antibiotics in the rivers is observed in disadvantaged and politically unstable countries, and near landfills and waste water treatment systems. Despite this regularity, in Europe and North America, as the contamination is bad. For example, the country with the most polluted with antibiotics in rivers in Europe suddenly became Austria.
Note that pollution of rivers is one of the most important factors that affects the global spread of various diseases. In disadvantaged countries, the situation with the treatment of water is terrible, so people are forced to drink dirty and contaminated water.
See also: Global warming contributes to the spread of diseases through water