• Influenza is a contagious respiratory illness caused by influenza viruses.
  • Influenza spreads around the world in seasonal epidemics.
  • Three influenza pandemics occurred in the 20th century and killed tens of millions of people.
  • Virus that causes chicken pox may remain latent in nerve cells within the body for decades.
  • The virus may re-emerge later in life as the disease called shingles.
  • Shingles is a disease caused by the same virus that causesChicken pox.
  • Some viruses can cause cancer, for example, human papillomavirus (HPV) causes cancer of the cervix in females.
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