I got tested for immunity to mmr but it came back negative, but i've had my vaccines.is this normal?or bc i had gbs around the time of vaccination?

MMR effectiveness: The vaccines are only about 98% effective. While this is a very good rate, it still means 1-2 out of every 100 people won't develop the protective antibodies. It would have nothing to do with an intercurrent gbs infection at the time of vaccination. In rare cases it is due to immune disorders of the patient. Talk with your doc about trying one additional booster and/or having immune system checked.

Probably normal: Nothing is 100%. The MMR will confer immunity to measles, mumps, and rubella for most people but some may not respond and will not be protected. Gbs would not likely have any impact one way or the other.

Can happen: A portion of the population will not have protective antibody levels after one or more doses of the vaccine, regardless of when they were given.That is why docs screen women contemplating pregnancies.Repeating the vaccine months prior to pregnancy can protect a fetus from the damaging effects of these viruses.Your gbs status doesn't effect the test.