Pandemic influenza (flu) is a worldwide flu outbreak that occurs every few decades. Infection with the influenza virus will spread rapidly to affect most countries and regions around the world. Pandemic flu is likely to cause the same symptoms as ordinary flu but the symptoms may be more severe because nobody will have immunity or protection against that particular virus. A high number of persons may likely become ill. Because pandemic flu is much more serious than "ordinary" flu, the California Department of Public Health is planning to be able to better respond to a worst case scenario event if it should occur.
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