Editor's Note: This is the first of a series of articles reviewing the world's experience with pandemic H1N1 influenza and what we've learned in the past year. Look for further installments in the days to come.
(CIDRAP News) A year's experience with the 2009 H1N1 influenza virus has underscored the endless unpredictability of flu.
The World Health Organization (WHO) listed a global total of 2,500 confirmed cases of swine influenza H1N1 in 25 countries today. That total included 1,204 cases in Mexico, 896 cases in the United States (yesterday's number), 214 in Canada, 88 in Spain, and 34 in the United Kingdom. The death toll remains at 44, including 42 in Mexico and 2 in the United States. [WHO update 22]