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Hepatitis B Vaccine Linked to Onset of Diabetes


WebMD Health News

June 13, 2000 (San Antonio) -- Faced with an ever-growing list of required and recommended vaccinations for children -- as well as occasional reports of safety problems linked to vaccines -- many parents understandably feel confused. No doubt adding to that confusion are reports that the vaccine against hepatitis B, a blood-borne illness that can cause liver cancer, may actually lead to the development of type 1 diabetes in children.

Type 1 diabetes is the form where the body doesn?t make the insulin it needs. An Italian study presented here at the annual meeting of the American Diabetes Association suggests that children who get the hepatitis B vaccine are at greater risk for developing type 1 disease than those who have never been vaccinated. On the basis of their research, Paolo Pozzilli, MD, and colleagues say doctors should exercise caution in giving the vaccine to children who have close relatives with type 1 diabetes.

But because type 1 diabetes is relatively rare in the overall population, thorough studies involving several hundred thousand participants are needed to prove a solid link, says Marion Rewers, MD, who was not involved in the study. So the jury is still out, he says.

"The possibility of a link between hepatitis B vaccine [and type 1 diabetes] is an interesting research area and has been recognized as such by a number of investigators across the world," he tells WebMD. He says that at two recent meetings, researchers "were in unanimous agreement that there was no association. We need a monitoring system, so that if an association is found in the future, it can be promptly identified." Rewers, a pediatric endocrinologist, is a professor of pediatrics and preventive medicine at the University of Colorado in Denver and chair of the ADA council on epidemiology and statistics.

The CDC recommends that the hepatitis B vaccine be a part of routine vaccination schedules for U.S. infants.

The hepatitis B vaccine is now required in Italy, says Pozzilli, a professor of pediatrics at the University of Rome. Further, there is a low, relatively stable rate of type 1 diabetes there. These conditions allowed the researchers to compare the rate of diabetes in vaccinated children with that in unvaccinated groups.

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