According to the review, the Department of Defense Smallpox Vaccination Program reported over 50 cases to date of myopericarditis inflammation of the heart muscle or of the sac surrounding the heart following vaccination.
"Reported rates of non-cardiac complications have been very low, in line with the rates of complications we saw historically, when children were routinely vaccinated for smallpox," said Dimitri C. Cassimatis, M.D., first author of the review and cardiology fellow at Walter Reed Army Medical Center in Washington, D.C. "The rate of cardiac complications, however, has been higher than expected."
"The individuals experiencing complications have responded well to therapy and almost all revert to normal," said Dr. Cassimatis. "More serious cardiac events, such as heart attacks and arrhythmias have not occurred at a rate greater than you would expect in this size population.
The U.S. Department of Defense resumed smallpox vaccination of military personnel in December 2002. As of June 2003, more than 450,000 military personnel have been vaccinated and carefully followed to identify and manage any adverse reactions to the vaccine. The Vaccine Health Care Center has systems in place to monitor and keep records of any adverse side effects resulting from any vaccination, including smallpox, according to Dr. Cassimatis.
"The rates of non-cardiac side effects, most of them quite mild, were at or below historic rates," he said. "The rate of myopericarditis was approximately eight out of 100,000 in those who received the vaccine for the first time a rate similar to what had been reported in some
Contact: Walter Reed Public Affairs Office
American Medical Association