CDC Head: We Didn't Expect So Many Cases of Sexually Transmitted Zika

CDC Head: We Didn't Expect So Many Cases of Sexually Transmitted Zika

At the house committee hearing, Dr. Anthony Fauci, said it appears the greatest risk for microcephaly occurs if the pregnant woman is infected with the Zika virus in her first trimester and that the severity of condition can vary.

Among the nine, two of the women miscarried early in their pregnancies, the CDC reported Friday.

In addition, 10 more cases of pregnant women who may possibly have had Zika virus infections are being investigated, according to the report.

The Zika virus is in Montana with the Montana Department of Public Health reporting that a woman in Missoula County tested positive for the virus after returning from a trip. Women who've had a Zika infection can give birth to children with smaller-than-normal heads.

This report emphasizes the importance of condom use or abstinence, as previously advised by the CDC for pregnant women whose male sexual partners have traveled to Zika-infected areas. Individuals who are pregnant and have traveled to an area with Zika transmission should talk to their healthcare provider about testing.

Margaret Chan said the link between Zika virus and microcephaly is becoming stronger, but the virus still hasn't been confirmed as the cause of the birth defects.

This is not the first time the Zika virus has been reported in the county.

Unlike Brazil and other nations, there is no evidence that mosquitoes are transmitting the disease in the United States.

According to the County News Center, the mosquitoes known to transmit the Zika virus, primarily the Aedes aegypti (yellow-fever mosquito), but also the Aedes albopictus (Asian tiger mosquito), are not native to San Diego. Brazilian authorities have recommended that women abstain from having sex while the outbreak is ongoing.

Severe brain defects were documented during an ultrasound and MRI scan at 20 weeks gestation in one of the cases in which the woman chose an abortion. All got the virus while visiting or living in places with Zika outbreaks.

"We're literally learning more about Zika every day", Frieden said.

The state of Florida reported Thursday, three cases of pregnant travelers in Florida.

Today, the CDC released data on nine pregnant U.S. travelers with Zika virus. The destinations include American Samoa, Brazil, El Salvador, Guatemala, Haiti, Honduras, Mexico, Puerto Rico and Samoa. The disease is typically spread by mosquito, and more than two dozen countries have reported cases of local transmission.