| update: novel influenza a (h1n1) virus infection - mexico, march-may, 2009. | on april 12, 2009, mexico responded to a request for verification by the world health organization (who) of an outbreak of acute respiratory illness in the small community of la gloria, veracruz. during april 15-17, the mexico ministry of health received informal notification of clusters of rapidly progressive severe pneumonia occurring mostly in distrito federal (metropolitan mexico city) and san luis potosi. in response, on april 17, mexico intensified national surveillance for acute respirato ... | 2009 | 19498336 |