What is the efficacy of the measles immunization?

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When the measles virus enters the body, it spreads through respiratory droplets from an infected person’s cough or sneeze. It initially infects the respiratory tract, then spreads to the lymphatic system and bloodstream, causing symptoms such as fever, cough, runny nose, conjunctivitis, and rash.

The body’s immune system responds by producing neutralizing antibodies that bind to the virus and prevent it from infecting cells. Other antibodies and immune cells also help destroy the virus. T-cells are activated to kill infected cells.

The measles component of the MMR (measles, mumps, rubella) vaccine contains a weakened measles virus. This weakened virus triggers the immune system to produce neutralizing antibodies and memory cells without causing the disease.

These memory cells provide long-term immunity by quickly responding if the actual virus is encountered later. Two doses of the MMR vaccine, given at 12 to 15 months and between four and six years, are about 97 % effective in preventing measles.

This typically provides lifelong immunity, so additional boosters are generally not needed. However, in outbreak situations or before traveling to high-risk areas, an extra dose may be recommended.

For those who might not develop sufficient immunity, a blood test can check antibody levels. If necessary, an additional vaccine dose can be given.

Widespread vaccination also creates herd immunity, protecting those who cannot be vaccinated, such as infants or individuals with certain medical conditions. In summary, the measles vaccine is highly effective in generating immunity and preventing the disease, contributing to overall public health.

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