|Click to enlarge. A (very) summary view of the latest|
contributing influenza viruses that precedes the emergence of
human infections with influenza A(H7N9) virus
in south-east China in 2013.
In a complex alphabet soup of influenza A virus findings, the authors, sequenced 34 H7N7, 4 H7N9 and 19 H9N2 egg-isolated viruses but also found H7N2 and H7N3 in ducks. Animals tested were chickens, ducks, geese, pigeons partridges and quail.
The authors note that rather than wild birds from Europe and Korea, the neuraminidase (NA or N) gene segment from H7N9 is more temporally related to those from H11N9 and H2N9 found in wild birds (wild water fowl, Northern shoveller and common teal) in Hong Kong during 2010-11 with links to domestic ducks in China prior to the H7N9 outbreak this year. Overall, domestic ducks proved to be an important mixing pot between wild birds and chickens.
And it's not just H7N9; the H7N7 found in chickens reminds us that the colours on the cubes are many and are in constant motion. These virus may become/may already be enzootic (endemic in non-humans) and so continuing exposures to live poultry in markets and backyards remains a continuing source of risk for new zoonoses.