#Surveillance for #human #infections with avian #influenza A(#H5) viruses: objectives, case #definitions, #testing and reporting (#WHO)
Key points • The overall objective of continual global surveillance for human infection with avian influenza A(H5) viruses is to detect and characterize any influenza A(H5) viruses infecting humans in order to: - (1) promptly trigger public health control and response actions, - (2) assess the trends of such infections and the public health risks posed (including the risk of a pandemic); and - (3) inform global pandemic preparedness activities. • Specific surveillance objectives include rapidly detecting human cases of influenza A(H5) virus infection, monitoring the incidence of new cases over time and geographical distribution, assessing and monitoring changes in transmission patterns to promptly detect any unusual events that may signal human-to-human transmission of the virus, characterizing and monitoring changes in any influenza A(H5) viruses infecting humans relative to those circulating in animals to inform control strategies, describing the clinica...