The makers of an experimental vaccine to prevent cervical cancer say a study shows the vaccine is 100 percent effective in the short term.
Researchers say the vaccine, called Gardasil, blocks infection with two of the sexually transmitted viruses that cause about 70 percent of cervical cancers.
Officials say the vaccine blocked the disease and lesions likely to turn cancerous.
A second, broader, analysis shows that after just one dose, the vaccine was 97 percent effective.
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