Eight months pregnant, Mara Torres stands next to a mosquito net placed over her bed in Cali, Colombia. Health officials in Cali have delivered mosquito nets to pregnant women to help protect them from the bites of mosquitoes that can transmit dengue, chikungunya or Zika. Luis Robayo /AFP/Getty Images hide caption

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Zika Infection Late In Pregnancy Carries Little Risk of Microcephaly

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Aedes aegypti mosquito photographed through a microscope. Felipe Dana/AP hide caption

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CDC: 157 Pregnant Women In The U.S. Have Tested Positive For Zika

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In some parts of the country, this might require bug spray. Steven Errico/Getty Images hide caption

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Who Should Be Worried About Zika And What Should They Do?

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Doctors don't always suggest that pregnant women get flu shots, which may account for the relatively low vaccination rates. Jamie Grill/Tetra images RF/Getty Images hide caption

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Molecular markers show structures and cell types within a human embryo, shown here 12 days after fertilization. The epiblast, for example, appears in green. Gist Croft, Alessia Deglincerti, and Ali H. Brivanlou/The Rockefeller University hide caption

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Advance In Human Embryo Research Rekindles Ethical Debate

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Tracy Smith, 38, and her children Hazel, 8, and Finley, 5, at their home in Houston. Smith is pregnant with twins and says she's a little more worried than usual about the approach of mosquito season. Carrie Feibel/Houston Public Media hide caption

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In Houston, Pregnant Women And Their Doctors Weigh Risks Of Zika

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A pregnant woman gets an ultrasound to monitor for the birth defect microcephaly, in Guatemala City last month. Johan Ordonez/AFP/Getty Images hide caption

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Pregnant Women May Be Able To Get Answers About Zika Earlier

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Amanda Hensley with her daughter, Valencia. Hensley says several hospitals and clinics she contacted were reluctant to help her quit her opioid habit. "Nobody wants to touch a pregnant woman with an addiction issue." Sarah Jane Tribble/WCPN hide caption

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Pregnant And Addicted: The Tough Road To Family Health

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Carolyn Rossi, a registered nurse at the Hospital of Central Connecticut, says the opioid epidemic has required nurses who used to specialize in care for infants gain insights into caring for addicted mothers, as well. Rusty Kimball/Courtesy of Hartford HealthCare hide caption

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To Help Newborns Dependent On Opioids, Hospitals Rethink Mom's Role

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More than 20,000 babies in the U.S. were born with congenital rubella syndrome during an outbreak of rubella in 1964-65. A vaccine developed in 1969 helped curb the virus's spread but hasn't eliminated it worldwide. Public Health Image Library/CDC hide caption

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Lessons From Rubella Suggest Zika's Impact Could Linger

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A medical researcher prepares tests for various diseases including Zika. Arnulfo Franco/AP hide caption

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How Best To Test For Zika Virus?

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