The Centers for Disease Control and Prevention should not recommend a vaccine against human papillomavirus (HPV) in pregnant women, a new study suggests.
The study was published in the Journal of Infectious Diseases on Thursday.
It comes after the CDC said in April that the vaccine has “no proven effectiveness” in preventing the disease.
It was the first time the agency has said it will not recommend the vaccine for pregnant women.
“I don’t know of any study that has shown that a vaccine is effective for preventing the spread of HPV infection,” said study author Jennifer J. M. Brown, a PhD student at the University of Illinois at Chicago.
“That’s an important distinction,” said Dr. Brown.
“We know that HPV is transmitted to women through sexual contact.”
The CDC said it’s still evaluating HPV vaccine effectiveness in pregnant patients.
“We want to be cautious in how we are interpreting this,” Dr. Scott Gottlieb, the agency’s director of the National Center for Immunization and Respiratory Diseases, said at a March 21 news conference.
“In particular, we want to make sure that we are doing everything we can to protect the health of the mother and the child before we give the HPV vaccine to a woman who is pregnant,” he said.
“The HPV vaccine is an important tool to help protect women from HPV and prevent new infections, but we want it to be used correctly.”
The vaccine has been in clinical trials for about 10 years, and the CDC says the results have been very encouraging.
The vaccine was approved for use in adults in 2008, and has been linked to a low rate of new infections.
The vaccine has not been linked with any cases of cervical cancer in the U.S.
However, there has been an increased incidence of infections with other types of HPV in recent years.
Dr. Gottliebar said that the rise in cases could be due to the use of more potent vaccines for other types, such as Gardasil and Cervarix.
He said he hopes that the study will lead to changes in the CDC’s guidelines on when and how to give the vaccine.
“There is no doubt in my mind that the HPV vaccination is a safe and effective option for preventing cervical cancer,” he added.
“But we must do everything we possibly can to make the vaccine more effective, because the HPV infection is much more common and can spread through other ways.”
The study also examined how a vaccine could be more effective than the HPV vaccines currently available.
It found that while both the Gardasils and Cordsillums are effective, the vaccine with the most efficacy in preventing HPV infection was Cervax.
The Gardasiles were associated with fewer cervical infections, and cervical cancer rates fell during the trial.