For a team of Canadian and French researchers, dark clouds on the horizon are potentially ominous not because they signal an approaching storm – but because they were found in a recent study to carry drug-resistant bacteria over long distances.
"These bacteria usually live on the surface of vegetation like leaves, or in soil," lead author Florent Rossi said in a telephone interview Friday.
The researchers from Laval University in Quebec City and Clermont Auvergne University in central France searched for antibiotic-resistant genes from bacteria found in cloud samples. An analysis of the retrieved mist revealed that they contained between 330 to more than 30,000 bacteria per milliliter of cloud water, for an average of around 8,000 bacteria per milliliter.Drug resistance occurs when bacteria are exposed to antibiotics and develop an immunity to them over generations.
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