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Metro Detroit measles outbreak: Vaccinated before 1989? You …




DETROIT – The number of confirmed cases of measles in Metro Detroit is still 41, but the number is expected to increase as more cases are confirmed.
                     

Local 4's Dr. Frank McGeorge is closely following developments to answer the most common questions.
                                  

The number of possible exposure areas and the steadily growing case count has people concerned.
                     

Many people want to know whether they are already protected because of their age or documented history of vaccinations.
                     

People born before 1

957 are considered to be immune because the vast majority of people over the age of 62 were infected with measles as a child and have a lifelong immunity.
                     

Anyone older than 62 who is concerned about measles can have their measles immunity checked by a blood test or can get a MMR vaccine.
                     

The first ever measles vaccine was introduced in 1963, but generally only one dose was administered.
                     

People between 30 and 61 years old who received only one dose of vaccine are considered to be immunized, but with only one dose, there is a chance that someone is not protected at 7 percent chance. Anyone in this group who may have been exposed or is concerned about measles should receive a second MMR vaccine.
                     

The second measles vaccine is often incorrectly called a "booster," but that's not accurate. One dose of measles vaccine induces an response 94 percent of the time. The second dose produces protection 97 percent of the time.
                     

The second dose is essentially to catch people who did not respond the first time.
                     

After 1989, two doses of the vaccine became routine practice. As long as people under 30 years old are vaccinated, they are considered protected.
                              

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