What Are Vaccines?

According to WHO, a vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains antigen either made from weakened or killed forms of the microbe, toxins or surface proteins. Vaccine stimulates the body's immune system to recognize the antigen as foreign, destroy it, and "remember" it, so when encountering the disease for the second time, the immune system can rapidly recognize and destroy the microorganisms, preventing further infections.

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Benefit of Vaccines

  • Vaccine is critical and efficient to establish herd immunity
  • More than 30 diseases have commercially-available vaccines, saving over 3 million lives every year
  • According to US CDC, for every 1 dollar spent in vaccination will save up to 16 dollars in disease treatment and productivity losses.