Washington state health officials on Friday said two pregnant women in Washington state have tested positive for the Zika virus.
Six people in Oregon have tested positive for Zika, including one person who contracted the virus through sexual transmission, the CDC confirmed.
The CDC will not say whether any of the Oregonians are pregnant.
During a joint news conference with Senator Patty Murray at Harborview Medical Center, doctors say they don't know how the virus will affect the Washington women's pregnancies, and that they were monitoring the women.
"Currently in Washington, we have tested 350 travelers who have had a concern or exposure to Zika," said Dr. Scott Lindquist, State Communicable Disease Epidemiologist . "Two of those women entered into our pregnancy registry."
"(The CDC) has created a pregnancy registry. Essentially, if you are pregnant and you either have confirmation of the virus or what's called the equivocal results where we can't rule it out, they want to follow those pregnancies through their term and also following the outcome. So we're talking about two people who meet those criteria."
"We know that they have Zika, or the antibodies test is positive for it, but we don't know what the outcome of the pregnancy is going to be yet."
Including the two pregnant women, Washington state now has four cases of the Zika virus, which has the potential to cause birth defects.
Meanwhile, Senator Patty Murray visited with doctors and health officials in Seattle Friday. She talked about her $1.1 billion emergency funding plan to prepare for the Zika fight as mosquito season gets underway.
The CDC put out new numbers Friday related to the Zika virus: 279 pregnant women in the U.S. are infected with the Zika virus, 122 of those are in the U.S. territory of Puerto Rico.
So far, fewer than a dozen pregnant women with Zika have had a problem, such as a miscarriage, or evidence that the fetus has a birth defect.