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You are here: Home / NEWS . . . . . . . . / Government Agencies / North American / The United States / CDC / Medical: 2 HPV shots may work as well as 3

Medical: 2 HPV shots may work as well as 3

September 7, 2011 By Jonathan Leave a Comment

The Republic
Columbus Indiana

By LEE BOWMAN – Scripps Howard News Service  

Just days after federal health officials released surveys that showed many young women aren’t getting the full three-dose vaccine series recommended to protect them against cervical cancer-causing human papillomavirus, a new study has come out that suggests one less dose may provide just as much immunity.

The research, carried out by scientists from the National Cancer Institute along with experts from Costa Rica and the Netherlands, was a four-year trial of the vaccine on women aged 18 to 25.

About 7,500 Costa Rican women were randomly assigned to receive either three doses of an HPV vaccine called Cevarix, or the same number of doses of vaccine against Hepatitis A. But about 20 percent of the women only got one or two shots, either because they became pregnant or were found to already have cervical abnormalities.

Researchers were able to follow this lightly vaccinated group as well, and at the end of a four-year follow-up period, women who had received just two doses of the HPV vaccine were found to have just as strong immunity against persistent infection from key strains of the virus as those who got the full three-dose schedule.

“Our study provides evidence that an HPV vaccine program using two doses will work. It may be that vaccinating more women, with fewer doses for each, will reduce cervical cancer incidence more than a standard three-dose program that vaccinates fewer women,” said Aimee Kreimer, an investigator with the cancer institute who lead the project.

She cautions that more research is needed to confirm the findings and determine how long lasting the immunity is with two doses. She also noted it is not clear that the results would be the same with the other, more common, HPV vaccine formula licensed in the U.S., Gardasil, or if the same level of benefit would be seen in other populations, such as those with chronic infections or malnutrition, that can impair immune function.

The study is the latest in a long line of research aimed at finding the optimal dosing and timing of vaccines, particularly among teens and young adults.

A 2010 survey of teen vaccination coverage conducted by the federal Centers for Disease Control and Prevention found that 49 percent got at least one dose of HPV vaccine, but less than a third got the recommended three doses.

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Filed Under: CDC, Cervarix Clinical Trials, Gardasil / Silgard, Science & Medicine, United States Tagged With: cervical cancer vaccine, Cevarix, HPV vaccine, Vaccine Adverse Reactions, vaccine clinical trials

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