What side effects have been reported with this
vaccine?
Fever is the most common side effect, occurring in
5%–15% of vaccine recipients. About 5% of people
develop a mild rash. When they occur, fever and
rash usually appear 7–12 days after vaccination.
About 25% of adult women receiving MMR vaccine
develop temporary joint pain, a symptom related to
the rubella component of the combined vaccine.
Joint pain only occurs in women who are not immune
to rubella at the time of vaccination. MMR vaccine
may cause thrombocytopenia (low platelet count) at
the rate of about 1 case per 30,000–40,000 vaccinated
people. Cases are almost always temporary and
not life-threatening. More severe reactions, including
allergic reactions, are rare. Other severe problems
(e.g., deafness, permanent brain damage) occur so
rarely that experts cannot be sure whether they are
caused by the vaccine or not.
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