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a global epidemic that occurs when a new flu virus appears in the human
a global outbreak caused when a new form of the influenza A virus emerges that can spread easily between humans, or an older form re-emerges after a long time
an outbreak of flu that would
a rapidly spreading global
a widespread outbreak of flu in humans
a world-wide outbreak of disease that occurs when a new influenza A virus appears in the human population, causes serious illness and is able to spread easily from person to person
a worldwide spread of the viral infection known as influenza (flu) with outbreaks or epidemics occurring in many countries and in most regions of the world
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