Federal health officials are renewing warnings about a rare bacterial illness that people can contract from animal carcasses. The Centers for Disease Control and Prevention urges doctors to watch for tularemia in patients who were around ticks or dead animals. CDC says eleven people in Oklahoma were sickened, two fatally, in an out outbreak last summer. The disease , commonly called rabbit fever, strikes suddently, usually bringing high fever, chills, fatigue and headache. About 100 cases are reported every year in the United States. Usually less than two percent are deadly.