Can I Get Measles if I Was Vaccinated as a Child
Can You Still Go the Measles If You've Been Vaccinated?
The number of measles cases in the U.S. continues to climb, with more than 550 cases reported from Jan to April, according to the Centers for Illness Control and Prevention (CDC). That's the second highest number of measles cases reported in any year since 2000, the CDC says.
Many of this year'due south cases occurred as role of ongoing measles outbreaks in several U.Due south. cities, and most infected people were unvaccinated, according to the CDC. Just if you've been vaccinated, can you however catch the disease?
Although it is possible to become the measles even if you've been vaccinated, it's quite rare: 2 doses of the measles, mumps and rubella (MMR) vaccine — which are given as part of the standard U.South. childhood vaccination schedule — are 97% constructive at preventing measles, co-ordinate to the CDC. This means that about three% of people who receive ii doses of the measles vaccine will become measles if they are exposed to the virus. [27 Devastating Infectious Diseases]
It'southward not articulate why some fully vaccinated people get measles, simply it could be that their immune system did non respond properly to the vaccine, the CDC says. (Withal, if a person is fully vaccinated, and they come down with measles, they are more than likely to have a mild instance of the illness.)
In addition, some people may be at a slightly higher risk of getting measles because they received only one dose of the MMR vaccine. Although the measles vaccine was developed in 1963, it wasn't until 1989 that health officials recommended that a kid receive two doses, according to the CDC.
This means there are "many people who are adults at present who only received ane dose" of MMR, said Dr. Amesh Adalja, a senior scholar at The Johns Hopkins Center for Health Security in Baltimore. One dose of MMR is still more than xc% effective at preventing measles, but it'south not quite equally good every bit two doses, Adalja said.
Adults who received only i dose of MMR equally a kid could consider getting a second dose, Adalja told Live Science. In situations where there are outbreaks going on, "I don't think its a bad idea," he said.
In addition, some people who received the measles vaccine in the 1960s may need to exist revaccinated. That's because, between 1963 and 1967, some people received a form of the measles vaccine known equally the "inactivated" (killed) vaccine, which was not effective, according to the CDC. People who received this class of the vaccine, or were vaccinated before 1968 and don't know what vaccine type they got, should be revaccinated with the electric current "live adulterate" form of the vaccine, the CDC says.
Waning immunity?
Another question people may have is whether the vaccine's protection wanes over time. Generally, people who've received two doses of MMR are considered protected for life, meaning they don't demand a booster shot, according to the CDC.
Still, there may exist some waning that happens with age, Adalja said.
There is a way to bank check your level of protection against measles. You can get a claret test that measures antibody levels confronting the measles virus. Still, doctors don't routinely use this exam on patients — information technology's more often used for health care workers who are generally at higher risk of being exposed to measles. But it may exist used in other situations: for example, for college students who need to show they are immune to measles, according to Academy of Rochester Medical Heart.
Generally, the CDC recommends that people who don't take written documentation of getting the MMR vaccine should go vaccinated. However, people who were born before 1957 are considered probable to exist allowed to the virus (because most people born at that time were infected naturally with the virus), and therefore don't need to be vaccinated.
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Originally published on Live Science .
Rachael has been with Live Science since 2010. She has a master's caste in journalism from New York Academy's Science, Health and Environmental Reporting Program. She as well holds a B.S. in molecular biological science and an M.S. in biology from the University of California, San Diego. Her piece of work has appeared in Scienceline, The Washington Post and Scientific American.
Source: https://www.livescience.com/65242-measles-vaccine-protection.html
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