NEW YORK (Reuters Health) - Pet hamsters are a potential source of serious infection, U.S. health officials warned on Thursday. Researchers from the U.S. Centers for Disease Control and Prevention (news - web sites) (CDC) describe the case of a 3-year-old boy from Colorado who came down with tularemia after being bitten by a pet hamster. Tularemia is caused by the bug Francisella tularensis, which is one of the most infectious germs known and for that reason is considered a potential biologic terrorism agent. As outlined in the CDC's Morbidity and Mortality Weekly Report, the boy's family purchased six hamsters...