MMR Vaccine Effectiveness: Understanding Measles Breakthroughs in Children

While the MMR vaccine is highly effective, there is a small chance that your daughter could still catch measles even after having both doses. This is known as a vaccine breakthrough infection.

The MMR vaccine is about 97% effective at preventing measles. This means that out of every 100 people who get the vaccine, 3 can still get measles. However, most people who get a breakthrough infection only have mild symptoms and do not need to be hospitalized.

There are a few factors that can increase the risk of a vaccine breakthrough infection, including:

* A weakened immune system. People with weakened immune systems, such as those with cancer or HIV, are more likely to get a breakthrough infection.

* Recent exposure to measles. If your daughter has been recently exposed to someone with measles, she is more likely to get a breakthrough infection.

* The strain of measles. Some strains of measles are more likely to cause breakthrough infections than others.

If you think your daughter may have measles, it is important to see a doctor right away. Measles can be a serious disease, and early treatment can help prevent complications.