19 March 2010 — As of 14 March 2010, worldwide more than 213 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 16813 deaths.

WHO is actively monitoring the progress of the pandemic through frequent consultations with the WHO Regional Offices and member states and through monitoring of multiple sources of information.

Situation update:

The most active areas of pandemic influenza transmission continue to be in Southeast Asia and West Africa. Limited data suggests that pandemic influenza activity may be increasing across parts of Central America and the Caribbean. Low levels of pandemic influenza virus continue to circulate across southern and south-eastern Europe and in East, West, and South Asia. Although pandemic influenza virus continues to be the predominant influenza virus circulating worldwide, seasonal influenza B viruses are predominate in East Asia, and have been detected at low levels across southeast Asia and eastern Africa.

In south and southeast Asia, the most active areas of pandemic influenza transmission continue to be in Thailand; over the past month approximately 25-30% of sentinel respiratory samples from patients with ILI and 10-35% of sentinel respiratory samples from hospitalized patients with pneumonia tested positive for influenza (predominantly pandemic H1N1, but also small numbers of seasonal B viruses). Recent pandemic influenza activity in Thailand, while associated with severe and fatal illness, does not appear to exceed activity observed during an earlier period of peak transmission between June and September 2009. In Myanmar, respiratory disease activity may be declining after a period of increased activity associated with increased detection of pandemic H1N1 cases during February 2010. In Bangladesh, an increasing trend in respiratory diseases activity was reported for the past two weeks in association with increased numbers of confirmed cases and increased geographical spread of pandemic influenza virus. In India, low level of pandemic influenza virus continues to circulate in western India.