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A quarter of the girls were relatively new vaccine against cervical cancer, federal health officials said Thursday.

This figure represents the government’s first substantial study of the vaccination rate of the vaccine, cervical cancer, which is a large number of Merck’s ads do not have to line 3, after the human papilloma virus infection or virus. The vaccine to prevent strains of the virus, resulting in about 70 percent of cervical cancer.

Health officials recommended that girls receive the ball when they are 11 or 12, if possible, they become sexually active. In addition, children under the age of 11, usually scheduled for a round of vaccinations.

The survey covers only children from 13 to 17.

The proponents hope that the vaccine has been much higher rate of vaccination, said the bar will greatly reduce the nearly 4,000 cervical cancer deaths that occur each year in the United States.

Patti Gravitt’s sports at Johns Hopkins University, an associate professor of epidemiology, said many families cautious about the safety of new vaccines.

Other aspects of the vaccine may also suspend some of the family. This is expensive, priced at about 375 U.S. dollars, although many of the health insurance coverage it has. There are problems, it is granted or a life-long immunity boosters, if the shot would be required.

“Some parents may take the attitude of their daughter and said, ‘Well, you are still young, I can wait a year or two before you are sexually active,” Gravitt said, who did not take part in the study.

Merck officials said they are pleased that the rate of vaccination.

The Center for Disease Control and Prevention study based on telephone surveys of households by 2007. The findings of the survey, covering the vaccine from the market in mid-2006, when the survey questions were answered.

Is based on the results of the nearly 3,000-year-old girl from 13 to 17, their researchers will be able to confirm the information through the vaccination of medical records.