As on August 4, 2009. World Health Organization (WHO) regions have reported 162,380 laboratory-confirmed cases of novel influenza A (H1N1) and 1,154 deaths. The laboratory-confirmed cases represent an underestimation of total cases in the world as many countries have shifted to strategies of clinical confirmation and prioritization of laboratory testing for only persons with severe illness and/or high risk conditions. More than 300 of the new deaths were in the Americas, bringing the death toll in that region to 1,008 since the virus first emerged in Mexico and the United States, and developed into the global epidemic.
The outbreak started in Mexico on 18th March, 2009 and spread to USA and Canada and then to other countries.
WHO raised the influenza pandemic alert to the highest level, Phase 6 on June 11, 2009.