2012-09-30-世界卫生组织-Influenza_at_the_human-animal_interface_summary_and_assessment,_1_October_2012_4页_290kb

Human infections with avian influenza A(H5N1) virus: As of 1 October 2012, 608 laboratory-confirmed cases and 359 deaths were reported to WHO from 15 countries, with 30 cases since January 2012. No new cases reported since the last update. The public health risk remains unchanged.

A(H3N2) variant virus: The United States reported additional cases with no deaths; most cases linked to swine exposure, with limited human-to-human transmission evidence. Adults may have immunity, but children do not, and seasonal vaccines offer no cross-protection. WHO has designated candidate vaccine viruses.

A(H1N1) variant virus: Cases detected in the US and Canada, with no confirmed human-to-human transmission. Viral strains show similarity to recent human influenza viruses, possibly indicating partial population immunity; seasonal vaccines may provide cross-protection.

Overall public health risks and recommendations: WHO assesses continued risk for non-human influenza viruses due to ongoing circulation in animal populations, potential for new human cases, and school-related factors. Global monitoring and surveillance are emphasized under IHR (2005), with existing immunity and vaccines offering some protection.