Cases and symptoms of swine flu H1N1 virus in human. The 2009 outbreak of swine flu is an epidemic of a new Influenza A H1N1 strain of flu virus that was clinically identified in April 2009. It is currently a Phase 5 outbreak, one level below an official pandemic.

International cases and responses

Although the exact origin of the outbreak is unknown, it was first detected when officials in Mexico and the United States suspected a link between an outbreak of late-season flu cases in Mexico and cases of influenza in Texas and California. Within days, hundreds more suspected cases were discovered in Mexico, with more cases also showing up in the U.S. and several other countries. By the end of April 2009, governments across the world had taken emergency measures to slow the transmission of a possible pandemic.

Swine Flu H1N1 Symptoms

According to the Centers for Disease Control and Prevention (CDC), in humans the symptoms of the 2009 "swine flu" H1N1 virus are similar to those of influenza and of influenza-like illness in general. Symptoms include fever, cough, sore throat, body aches, headache, chills and fatigue. The 2009 outbreak has shown an increased percentage of patients reporting diarrhea and vomiting. The 2009 H1N1 virus is not zoonotic swine flu, as it is not transmitted from pigs to humans, but from person to person.

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