Mosquitoes can carry viruses including dengue, malaria, chikungunya and Zika. They are a growing public health threat abroad and in the United States. Rick Bowmer/AP hide caption
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This mosquito spreads dengue, Zika and yellow fever too. Could these diseases make a human emit an odor that draws the insect in to take a bite? Joao Paulo Burini/Getty Images hide caption
Why mosquitoes might find you irresistible. Hint: A viral lure
Yaritza Martinez developed a Zika virus infection in 2016 when she was pregnant with her son Yariel, who is now 5 years old. Yariel is enrolled in a long-term study following a group of babies in the U.S. and in Colombia to see how they have been developing. Meredith Rizzo/NPR hide caption
5 years later, researchers assess how children exposed to Zika are developing
Rochelle dos Santos helps her daughter with physical therapy. Many children with congenital Zika disorder are physically disabled. Ueslie Marcilino/Undark Magazine hide caption
A female Aedes aegypti mosquito feeds on human skin. James Gathany/CDC/Smith Collection/Gado/Getty Images hide caption
With her blood meal visible through her transparent abdomen, the female Aedes aegypti mosquito takes flight as she leaves her host's skin surface. James Gathany/CDC Public Health Image Library hide caption
Why One Dangerous Mosquito Developed A Taste For Human Blood
Mother Daniele Santos holds her baby Juan Pedro, who has microcephaly, on May 30, 2016, in Recife, Brazil. Researchers are now learning that Zika's effects can appear up to a year after birth. Mario Tama/Getty Images hide caption
Babies Who Seem Fine At Birth May Have Zika-Related Problems Later, Study Finds
The beaches of Brazil beckon — but travelers need to find out if they're heading to a part of the country where a yellow fever vaccine is recommended. Diego Herculano/NurPhoto via Getty Images hide caption
A Miami-Dade County mosquito control worker sprays around a home in August 2016 in the Wynwood area of Miami. A University of Florida study recently identified the first known human case of the mosquito-borne Keystone virus. Alan Diaz/AP hide caption
A woman who is eight months pregnant in Recife, Brazil. The Zika virus has been rampant in this region. Matt McClain/The Washington Post/Getty Images hide caption
Twins Heloisa (left) and Heloa Barbosa, both born with microcephaly, had a one-year birthday party on April 16 in Areia, Brazil. Their mother says she contracted the Zika virus during pregnancy. Mario Tama/Getty Images hide caption
Aedes aegypti mosquitoes in various stages of development displayed in Brazil in 2016. Mario Tama/Getty Images hide caption
Maria Carolina Silva Flor and Joselito Alves dos Santos with their 18-month-old daughter, Maria Gabriela Silva Alves. The baby was born with Zika syndrome. Amanda Klasing hide caption
When the Centers for Disease Control and Prevention lifted its last Zika travel advisory for Miami-Dade County last week, residents and visitors to Miami's popular South Beach neighborhood were relieved. Still, doctors say, pregnant women should continue to take extra precautions. Joe Raedle/Getty Images hide caption
Pregnant women â and those trying to get pregnant â should not travel to places where the Zika virus is circulating. For children, age is a factor. Alessandro Abel/Getty Images/EyeEm hide caption
Is Zika Dangerous For Kids? It Probably Depends On The Age
Puerto Rico resident Michelle Flandez caresses her two-month-old son Inti Perez, diagnosed with microcephaly linked to the mosquito-borne Zika virus. The U.S. Centers for Disease Control and Prevention says the Zika virus continues to impact a small number of pregnant women and their babies in the U.S. Carlos Giusti/AP hide caption
A family member holds twins Eloisa (left) and Eloa, both 8 months old and born with microcephaly, during a Christmas gathering. The mother of the twins, Raquel, who lives in Brazil, said she contracted Zika during her pregnancy. Mario Tama/Getty Images hide caption
Yalieth Gonzalez and her baby Micaela Delgado at the Maternal Infant Studies Center at the University of Puerto Rico. Marisa Penaloza/NPR hide caption
Living With Zika In Puerto Rico Means Watching, Waiting And Fearing Judgment
The National Institutes of Health is based in Bethesda, Md., but the vast majority of its research funding flows to universities around the country. NIH/Flickr hide caption
Andie Vaught grasps a stress toy in the shape of a truck as she prepares to have blood drawn as part of a clinical trial for a Zika vaccine at the National Institutes of Health in Bethesda, Md., in November 2016. Allison Shelley/The Washington Post/Getty Images hide caption
From left: A scene from the video of a car crash test; illustration of a mosquito transmitting the Zika virus; a menstrual shed in Nepal. Insurance Institute for Highway Safety/YouTube; BSIP/UIG via Getty Images; Poulomi Basu/Magnum Emergency Fund hide caption
No one is sure why the northeastern part of Brazil has been hit so hard with microcephaly cases. Felipe Dana/AP hide caption
Florida Department of Health workers package a urine test, part of the state's effort to provide free Zika tests to pregnant women. Joe Raedle/Getty Images hide caption