Scientists find bacteria resistant to nearly all antibiotics in Antarctica sea water

January 29, 2012 – ANTARTICA – Bacteria that can resist nearly all antibiotics have been found in Antarctic seawater. Björn Olsen of Uppsala University in Sweden and colleagues took seawater samples between 10 and 300 meters away from Chile’s Antarctic research stations, Bernardo O’Higgins, Arturo Prat and Fildes Bay. A quarter of the samples of Escherichia coli bacteria carried genes that made an enzyme called ESBL, which can destroy penicillin, cephalosporins and related antibiotics. Bacteria with these genes can be even more dangerous than the better known superbug MRSA. That’s because the genes sit on a mobile chunk of DNA that can be acquired by many species of bacteria, increasing the incidence of drug-resistant infections such as the E. coli outbreak last year in Germany. The type of ESBL they found, called CTX-M, is common in bacteria in people, and the Uppsala study found that concentrations of resistant bacteria were higher close to the sewage outfalls from the stations. Some Antarctic stations started shipping out human feces for incineration after gut bacteria were found nearby. Chile’s research stations have virtually no sewage treatment in place, says Olsen. Recent work shows the bacteria may hang on to the genes for CTX-M even when no longer exposed to antibiotics, suggesting that superbugs can survive in the wild, with animals acting as a reservoir. Penguins near the Chilean stations have been checked and are free of ESBL, though Olsen is now looking at the area’s gulls as he has found ESBL-producing bugs in gulls in France. “If these genes are in Antarctica, it’s an indication of how far this [problem] has gone,” he says. –New Scientist

“The environmental overturning of the natural ecology also has the potential to unleash some of nature’s unknown and exotic new viruses. In November of 2009, a research team which included Antonio Alcami, a researcher from the Spanish Research Council, took water samples from Limnopolar Lake on Livingston Island in Antarctica. The researchers were surprised what they discovered was lurking in the icy waters under the ice at the South Pole. “They found nearly 10,000 virus species, including some small DNA viruses that had never before been identified.”’ –The Extinction Protocol, p. 243

About these ads