Is the strain of mumps virus in Iowa a rare strain?
No, it is the same strain seen in an outbreak in England. The current MMR vaccine covers this strain. << Mumps information page Why are so many cases occurring in vaccinated people? There have been many questions about why people, who have been vaccinated, are getting mumps. As you read through the examples that follow, keep these key points in mind. • The mumps vaccine (part of the MMR vaccine) is about 95% effective. • This means out of every 100 people vaccinated, 95 will be protected. However, the vaccine will not "take" in 5 people, and these people will remain susceptible to the disease. • By comparison, the measles vaccine (also part of the MMR vaccine) is about 98% effective and the annual influenza vaccine is about 70-85% effective. Example 1: In a community of 100 people, 100% have been vaccinated. Everyone is exposed to mumps. What happens? • 95 people (95%) in the community are protected by the vaccine and do not get mumps. • 5 people (5%) in the community become ill with m
No, it is the same strain seen in an outbreak in England. The current MMR vaccine covers this strain. << Mumps information page Anything significant in MMR at 12mos vs. 15mos? No. There is no correlation to disease and vaccination at 12 months of age. Infants used to be routinely vaccinated at 15 months of age. During the 1989-1991 measles resurgence, incidence rates of measles were more than twice as high as those in other age groups. The mothers of many young infants who developed measles were young, and their measles immunity was most often due to vaccination rather than infection with wild virus. As a result, a smaller amount of antibody was transferred across the placenta to the fetus, compared with antibody transfer from mothers who had higher antibody titers resulting from wild infection. The lower quantity of antibody resulted in immunity that waned more rapidly, making infants susceptible at a younger age than in the past. At this time the routine MMR vaccination age was lower
