Being exposed to an H1N1 strain of influenza while in utero increases the risk of having cardiovascular disease later in life, according to a study in the Journal of Developmental Origins of Health and Disease. Researchers examined more than 100,000 people born during or near the 1918 influenza pandemic in the United States. They found that men born in the first months of 1919 (women who were in their second or third trimester during the outbreak) had a 23 percent greater risk of having heart disease after the age of 60 compared to the overall population. Women with the same circumstances were not found to have an increased risk for cardiovascular disease.

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