The vaccine targets HPV 16, one of more than 100 strains of the human papilloma virus. [...] HPV 16 can trigger abnormal cell growth and is responsible for more than half of all cases of cervical cancer. The virus is spread through intercourse, oral or anal sex. [...] For those who completed the study and didn't start off with HPV, there were 12 precancerous lesions and 111 cases of infection among the 750 placebo recipients. No lesions were found in the group of 755 who received the vaccine, while seven women developed infections.The study followed a total of about 2400 women. None of the women who received the trial vaccine developed precancerous lesions, while 12 of the women who received placebos did.
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