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The Centers for Disease Control and Prevention said it's investigating 10 more reports of pregnant travelers with Zika. According to the World Health Organization (WHO), the Zika virus outbreak is likely to further spread in South, Central and North America.

Also on Friday, the CDC issued a caution to people planning to attend the Olympics this summer in Rio de Janeiro.

The CDC Morbidity and Mortality Weekly Report contains more information about these existing Zika cases.

There is so much still unknown about the virus, like whether it causes microcephaly in infants, a problem defined by abnormally tiny heads that can lead to developmental problems.

Details on the second abortion case were not released, and the CDC declined to say whether or not both the women made their decisions specifically because of Zika.

Two of the women miscarried, and two elected to terminate their pregnancies.

"All nine women reported at least one of the four most commonly observed symptoms (fever, rash, conjunctivitis, or arthralgia), all women reported rash, and all but one woman had at least two symptoms", CDC said.

One delivered a healthy baby and the other is continuing her pregnancy.

One woman gave birth to a baby with microcephaly - a case that has been previously reported by state health authorities.

Estafany Perreira holds her nephew David Henrique Ferreira, 5 months, who has microcephaly, on January 25, 2016 in Recife, Brazil.

The CDC said all are US residents, but it declined to answer a question on their citizenship.

Those destinations are among the 30 places now on the CDC's travel alert.

CDC said it was rushing tests out to states so that pregnant women who suspect they are infected can be tested for Zika.

The logos of the Rio 2016 Olympic Games and Rio 2016 Paralympic Games are pictured next to a message on a screen that reads "Message about Zika" during a media briefing in Rio de Janeiro, Brazil, February 2, 2016.

"Either use condoms the right way, every time, or do not have sex during your pregnancy", the agency said.

Women who are trying to become pregnant should talk to their doctors before making the trip, the CDC advised.

The CDC recommends that all travelers use insect repellent while in Zika outbreak areas, and continue to use it for three weeks after travel in case they might be infected but not sick.

Research also is underway into a possible link between Zika and a paralyzing condition in adults called Guillain-Barre.

"Approximately half a million pregnant women are esti­mated to travel to the United States annually from the 32 Zika-affected countries and US territories with active transmission of Zika virus", the CDC said.

Zika's a mosquito-borne virus, spread as female Aedes mosquitos sip blood from one person after another, often in the same room.

"We did not expect to see these brain abnormalities in this small case series of U.S. pregnant travelers", said Denise Jamieson, a birth defects expert.