In the spring of 2009, a new influenza virus to spread rapidly across the United States and the world. The first case in the United States of H1N1 (swine) was diagnosed on April 15, 2009. On April 21, the Center for disease control and prevention (CDC) has been working to develop a vaccine for the new virus. On April 26, the us Government has declared a State of emergency public health H1N1.In June, 18,000 cases of H1N1 infection have been reported in the United States. A total of 74 countries affected by the pandemic. H1N1 vaccine supply was limited in the beginning. The number of people at the highest risk of complications that the vaccine first.By November, 2009, 48 countries have reported cases of H1N1, mainly in young people. Also that month, more than 61 million doses of vaccine were available. Reports of influenza activity started to decline in parts of the country, were brought to the medical community the opportunity to vaccinate more people. 80 million people have been vaccinated with H1N1 vaccines, which minimizes the impact of the disease.
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