A researcher with Sinovac Biotech Company begins preparation work for producing A/H1N1 influenza vaccine for human use with the seed lot of flu virus "NYMCX-179A". China received on Monday, June 8, 2009 the flu strain samples shipped from the United States, for the mass production of A/H1N1 influenza vaccine. Chinese drug companies are expected to have the vaccine produced by July. [Photo: Xinhua]