Archive for May 3rd, 2013

The highly pathogenic H7N3 avian influenza strain from July 2012 in Mexico acquired an extended cleavage site through recombination with host 28S rRNA

3 May, 2013

See on Scoop.itVirology News

A characteristic difference between highly and non-highly pathogenic avian influenza strains is the presence of an extended, often multibasic, cleavage motif insertion in the hemagglutinin protein.


This highly pathogenic H7N3 avian influenza strain acquired a novel extended cleavage site which likely originated from recombination with 28S rRNA from the avian host. Notably, this new virus can infect humans but currently lacks critical host receptor adaptations that would facilitate human to human transmission.

Ed Rybicki‘s insight:

This is rather sinister!  Not only can influenza viruses mutate, for antigenic drift, and reassort with one aother for antigenic shift – they can now recombine with HOST sequences to increase pathogenicity!

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