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Slight Risk of Bleeding Disorder No Reason to Avoid MMR Vaccine

WebMD Health News

Feb. 22, 2001 -- A recent episode of the television show ER dealt with the case of a 4-year-old child who died from complications of measles. He contracted the disease because his mother worried about possible (but unproven) side effects from the measles-mumps-rubella (MMR) vaccine and failed to immunize him.

As physicians have long suspected and British researchers now confirm in a study published in the journal Archives of Disease in Childhood, there is a very slight risk that children who receive the MMR vaccine will develop a treatable rash-like condition called idiopathic thrombocytopenic purpura, or ITP. But children who don't get the vaccine are much more likely to get ITP and are at grave risk for serious complications such as pneumonia, diarrhea, seizures, brain damage, hearing loss, and death from measles.

"Although our study shows that some children are admitted to hospital for ITP, even in these cases the disease is rarely dangerous and can be easily treated. This is in stark contrast to measles, mumps, and rubella, which can have very serious consequences and be difficult to treat. The risks associated with ITP are small when compared to those of the diseases which this vaccine is designed to prevent," says lead author Elizabeth Miller, MD, head of the immunization division at the Public Health Laboratory Service communicable disease surveillance center in London, in a written statement.

ITP is a bleeding disorder resulting from a shortage of blood cells that help the blood to clot. People with ITP bruise easily and have characteristic purple patches caused by bleeding under the skin. In children, it may occur following a viral infection and usually resolves itself without treatment, although some patients may require hospitalization in order to control the bleeding.

In their study, Miller and colleagues looked at hospital admissions for ITP in children in two regions of England and calculated that 1 in every 22,300 MMR vaccinations would result in hospital admission for ITP. They also estimate that for cases of ITP occurring within six weeks of MMR vaccine, two out of three are probably linked to the vaccine. But they also found that the risk of ITP is high after natural measles infections and follows about 1 in 3,000 rubella cases, and that more than 70% of ITP cases occur following a viral infection.

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