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Sea otters can get the flu, too
Date:4/8/2014

Northern sea otters living off the coast of Washington state were infected with the same H1N1 flu virus that caused the world-wide pandemic in 2009, according to a new U.S. Geological Survey and Centers for Disease Control and Prevention study.

During an August 2011 health monitoring project, USGS and CDC scientists found evidence that the Washington sea otters were infected with the pandemic 2009 H1N1 virus, although the exact date and source of exposure could not be determined. The findings suggest that human flu can infect sea otters.

"Our study shows that sea otters may be a newly identified animal host of influenza viruses," said Hon Ip, a USGS scientist and co-author of the study.

The researchers discovered antibodies for the 2009 H1N1 flu virus in blood samples from 70 percent of the sea otters studied. None of the otters were visibly sick, but the presence of antibodies means that the otters were previously exposed to influenza. Further tests concluded that the antibodies were specific to the pandemic 2009 H1N1 flu virus, and not from exposure to other human or avian H1N1 viruses.

"We are unsure how these animals became infected," said Zhunan Li, CDC scientist and lead author on the paper. "This population of sea otters lives in a relatively remote environment and rarely comes into contact with humans."

An unrelated 2010 study showed that northern elephant seals sampled off the central California coast had also been infected with the 2009 pandemic H1N1 virus. This elephant seal exposure is the only other known pandemic H1N1 influenza infection in marine mammals, and similar to sea otters, it is unclear how the seals were exposed.

"Our new study identifies sea otters as another marine mammal species that is susceptible to influenza viruses and highlights the complex interspecies transmission of flu viruses in the marine environment," said USGS scientist LeAnn White.

The 2009 H1N1 virus ha
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Contact: Gail Moede Rogall
gmrogall@usgs.gov
608-270-2438
United States Geological Survey
Source:Eurekalert

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