The CDC said out of at least 81 health care workers in the U.S. reported to have the H1N1 flu virus, about half contracted the virus while on duty. The agency said this indicates that hospitals and personnel are not taking the proper steps to contain virus spread. The CDC recommended several preventive measures, including prompt identification of those who need to be isolated, annual vaccination and the prophylactic use of Tamiflu on health care workers exposed to the virus.

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