In the study, adults ages 85 and over who were infected with cytomegalovirus were about twice as likely to have Type 2 diabetes compared with those not infected.
Cytomegalovirus is a type of herpes virus found in 50 to 80 percent of adults over age 40; most people experience no symptoms of the infection.
The findings suggest that cytomegalovirus infection plays a role in the development of Type 2 diabetes in the elderly, the researchers said. However, the study found an association, not a cause-effect link.
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