Bi-weekly influenza surveillance overview, 25 Jul-07 Aug 2011 - Weeks 30-31

During weeks 30–31/2011, no influenza activity was detected by the 18 reporting countries.• Sentinel specimens yielded no influenza detections while seven type A and two type B influenzas were detected in non-sentinel specimens. Of the type A viruses, two were A(H1)2009 and three were A(H3).• One case of SARI and one case of hospitalised severe influenza were reported.