Bi-weekly influenza surveillance overview, 19 Sept/2 Oct 2011 - Weeks 38-39

• During the last two weeks (38-39/2011) of the off-season period, low influenza activity was notified by 19 reporting countries.• No influenza viruses were detected in sentinel specimens. Three influenza A viruses were detected in non-sentinel specimens. Two of these were subtyped as A(H1)2009 influenza viruses.• Two SARI cases unrelated to influenza were reported by Slovakia.