News & Perspective

Nov 03, 2006

Nov 03, 2006

Study says new H5N1 strain pervades southern China

(CIDRAP News) – A new subtype of H5N1 avian influenza virus has become predominant in southern China over the past year, possibly through its resistance to vaccines used in poultry, and has been found in human H5N1 cases in China, according to researchers from Hong Kong and the United States.

Aug 18, 2006

Aug 18, 2006

WHO changes H5N1 strains for pandemic vaccines, raising concern over virus evolution

(CIDRAP News) – The World Health Organization (WHO) today changed the H5N1 avian influenza strains recommended for candidate vaccines for the first time since 2004, causing some experts to question how far the virus has evolved.

The WHO's new prototype strains, prepared by reverse genetics, include three new H5N1 subclades.