As a public health expert with extensive knowledge in the field of immunization, I am well-versed in the intricacies of vaccine efficacy and the dynamics of infectious diseases. Vaccination is one of the most effective ways to prevent the spread of communicable diseases such as measles. The measles vaccine has been a cornerstone in the fight against this highly contagious viral illness.

Measles Vaccine and Its Efficacy
The measles vaccine is part of the routine childhood immunization schedule in many countries. It is designed to stimulate the immune system to produce an immune response against the measles virus, providing protection against future infections. The vaccine is typically administered in two doses, with the first dose given between 12 to 15 months of age and the second dose between 4 to 6 years of age.

**Vaccination and the Possibility of Measles Infection**
While the measles vaccine is highly effective, it is important to understand that no vaccine is 100% effective. This means that there is a possibility, albeit small, that an individual who has been vaccinated can still contract measles if exposed to the virus. According to the Centers for Disease Control and Prevention (CDC), approximately 3% of people who have received two doses of the measles vaccine may still contract the disease if they come into contact with the virus.

Factors Influencing Vaccine Efficacy
Several factors can influence the efficacy of the measles vaccine. These include the individual's immune system, the timing and administration of the vaccine, and the presence of other health conditions that might affect the body's ability to respond to the vaccine. Additionally, the vaccine's efficacy can be influenced by the strain of the measles virus and the overall health of the population.

Importance of Herd Immunity
One of the key concepts in public health is herd immunity. This occurs when a significant portion of the population is immune to an infection, either through vaccination or previous infection, thereby reducing the likelihood of the disease spreading. Herd immunity is crucial in protecting those who cannot be vaccinated, such as individuals with compromised immune systems or those with certain medical conditions.

Conclusion
In conclusion, while vaccination significantly reduces the risk of contracting measles, it does not eliminate it entirely. The small chance of contracting measles despite vaccination is a testament to the importance of maintaining high vaccination rates to achieve herd immunity and protect the community as a whole. It is also a reminder of the ongoing need for research and development in vaccines to improve their efficacy and safety.

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Yes, people who have been vaccinated can get the measles, but there is only a small chance of this happening. About 3 percent of people who receive two doses of the measles vaccine will get measles if they come in contact with someone who has the virus, according to the CDC.Feb 5, 2015read more >>