Definitions
Pandemic - an epidemic or infectious disease that spreads through populations across a large area, for instance a continent of worldwide. Virus - a submicroscopic infectious agent that is unable to grow outside a host cell.
Flu or Influenza - an infectious disease cause by RNA viruses that infects mammals and birds. Fever and coughs are the most frequent symptoms.
Epidemic - a certain disease that appears in a human population within a given time that substantially exceeds what is expected based on recent experience.
H1N1 - Influenza virus subtype H1N1 is a subtype of influenzavirus A and the most common cause of influenza in humans.
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