The HealthMap NEJM H1N1 page is no longer providing real-time updates. However, the historical archive of alerts from April 1st, 2009 - June 30th, 2010 will remain available as a permanent record of the global spread of the 2009 H1N1 pandemic.
* As of mid-July, reports are no longer available from official channels.
J.S. Brownstein, C.C. Freifeld, and L.C. Madoff (2009) Influenza A (H1N1) Virus, 2009 - Online Monitoring, New England Journal of Medicine
Official data is obtained from CDC and WHO daily Influenza A (H1N1) updates. Informal data sources are a subset of reports from the HealthMap database. The case numbers shown are cumulative counts. HealthMap is a public website bringing together disparate data sources to achieve a unified view of the current global state of infectious diseases.
