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Distinct avian influenza viruses found in Antarctic penguins
Date:5/5/2014

An international team of researchers has, for the first time, identified an avian influenza virus in a group of Adlie penguins from Antarctica. The virus, found to be unlike any other circulating avian flu, is described in a study published this week in mBio, the online open-access journal of the American Society for Microbiology.

While other research groups have taken blood samples from penguins before and detected influenza antibodies, no one had detected actual live influenza virus in penguins or other birds in Antarctica previously, says study author and Associate Professor Aeron Hurt, PhD, a senior research scientist at the WHO Collaborating Centre for Reference and Research on Influenza in Melbourne, Australia.

For the study, Hurt and colleagues collected swabs from the windpipes and posterior openings of 301 Adlie penguins, and blood from 270 of those penguins, from two locations on the Antarctic Peninsula: Admiralty Bay and Rada Covadonga. The samples were collected during January and February 2013.

Using a laboratory technique called real-time reverse transcription-PCR, the researchers found avian influenza virus (AIV) genetic material in eight (2.7%) samples, six from adult penguins and two from chicks. Seven of the samples were from Rada Covadonga. The researchers were able to culture four of these viruses, demonstrating that live infectious virus was present. On further analysis of the samples, the researchers found all viruses were H11N2 influenza viruses that were highly similar to each other.

But when the researchers compared the full genome sequences of four of the collected viruses to all available animal and human influenza virus sequences in public databases, "we found that this virus was unlike anything else detected in the world," says Hurt. "When we drew phylogenetic trees to show the evolutionary relationships of the virus, all of the genes were highly distinct from contemporary AIVs circul
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Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert  

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