Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Timeline of recruitment of cases testing positive or negative for influenza virus by type/subtype in Hong Kong (background colour indicated period from September to December, January to April and May to August), September 2012 to August 2017.
