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Early signs show that 2014-15 flu season may be severe, CDC warns

BMJ 2014; 349 doi: http://dx.doi.org/10.1136/bmj.g7530 (Published 05 December 2014) Cite this as: BMJ 2014;349:g7530
  1. Michael McCarthy
  1. 1Seattle

The most common influenza viruses causing illnesses so far this year are seasonal H3N2 influenza A viruses, which in the past have been associated with severe flu illnesses and high mortality rates, the US Centers for Disease Control and Prevention (CDC) said on 4 December. And about half of the H3N2 viruses that have been analyzed show genetic changes that may make this year’s vaccine less effective, it said.

“We know that in seasons when H3 viruses predominate, we …

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