Why Are People So Worried About It?
Experts are concerned that the H5N1 strain of bird flu could mutate (change) into a new form that can rapidly spread from person to person. This has happened in past flu outbreaks and has caused what is known as a pandemic. A pandemic is a global outbreak of a disease that causes serious illness in people and spreads quickly throughout populations.
Vaccines can help keep a virus infection from spreading and causing a pandemic. Although there is no vaccine for the H5N1 flu virus right now, scientists are working on one.
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