In order for herd immunity to happen about 95% of the US population need to be vaccinated. This is why there are still Measles caused deaths in 1st world countries. With the initial release of the vaccine in 1963, measles cases fell by a factor of 15 or more. In the mid 1970s with increased uptake of the vaccine these cases fell into the thousands. Serious complications with the disease are much more likely in children under the age of 6, making it crucial for children to be vaccinated at a very young age. Adults wont be immune but are much less likely to suffer from life threatening complications. Measles has some very serious symptoms that untreated can be deadly. Many medical advancements make it not as severe, but only in 1st world
In order for herd immunity to happen about 95% of the US population need to be vaccinated. This is why there are still Measles caused deaths in 1st world countries. With the initial release of the vaccine in 1963, measles cases fell by a factor of 15 or more. In the mid 1970s with increased uptake of the vaccine these cases fell into the thousands. Serious complications with the disease are much more likely in children under the age of 6, making it crucial for children to be vaccinated at a very young age. Adults wont be immune but are much less likely to suffer from life threatening complications. Measles has some very serious symptoms that untreated can be deadly. Many medical advancements make it not as severe, but only in 1st world