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Human relative of Hepatitis A virus found in seals

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5 Dariya News

New York , 26 Aug 2015

Scientists have identified a deadly strain of new virus in seals which is the closest-known relative of the human hepatitis A virus. The discovery provides new clues on how hepatitis A emerged on earth.Until now, scientists thought that hepatitis A had no close relative and only humans and other primates could be infected by such viruses."Our findings show that these so-called 'hepatoviruses' are not, in fact, restricted to primates and suggest that many more may also exist in other wildlife species,” said Simon Anthony, assistant professor of epidemiology from Columbia University's Mailman School of Public Health.Hepatitis A viral infection, which impacts 1.4 million people worldwide annually, can cause mild to severe illness.

It is a highly contagious disease that is usually transmitted by the fecal-oral route, either through person-to-person contact or through consumption of food or water."Our data suggest that hepatitis A and this new virus share a common ancestor, which means that a spillover event must have occurred at some point in the past,” Anthony explained.It raises the question of whether hepatitis A originated in animals, like many other viruses that are now adapted to humans.The researchers discovered the new virus while investigating a deadly strain of avian influenza that killed over 150 harbour seals off the coast of New England in 2011.They discovered a new virus that was genetically similar to hepatitis A and named it phopivirus.An analysis of additional animals living off the coast of New England identified phopivirus in seven more animals.

In the natural history of phopivirus and hepatitis A, it is unclear whether a common ancestor (virus) spilled over from humans to seals, vice versa, or from a third unrelated host that has not yet been identified.However various factors, including the fact that the virus was found in different species of seals, suggest that the virus has been present in seals for a fairly long time.The researchers next plan to look at species that have close interactions with seals to see if they can find other wildlife reservoirs of hepatitis A-like viruses.The research appears in mBio, the online open-access journal of the American Society for Microbiology.

 

Tags: HEALTH , STUDY

 

 

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