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WASHINGTON - Merck's blockbuster vaccine Gardasil, used to prevent cervical cancer in women, also stops viruses that cause genital warts in men, the Food and Drug Administration said Friday. In documents posted online, the FDA said the vaccine prevented genital warts in males 90 percent of the time. The vaccine works by blocking the two strains of the human papilloma virus, or HPV, which causes irregular growths and rare types of cancer in male genitals. Merck has asked the FDA to approve Gardasil for boys and men ages 9 to 26. A panel of advisers will weigh in on the new use next week. The FDA is not required to follow the advice, though it usually does.

- Associated Press