Surgeon General Vivek Murthy looks at a sample of mosquitoes in Orlando, Fla., on Monday. With him is Department of Health and Human Services Secretary Sylvia Burwell and Orange County Mayor Teresa Jacobs. John Raoux/AP hide caption
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zika
Friday
Thursday
Blood donations in the U.S. aren't routinely screened for the Zika virus. Chris O'Meara/AP hide caption
Friday
Larry Smart, a Miami-Dade County mosquito control inspector, uses a fogger to spray pesticide to kill mosquitoes in an effort to stop a possible Zika outbreak in Miami. Joe Raedle/Getty Images hide caption
Miami Steps Up Mosquito Control Efforts After Suspected Zika Cases
Monday
Zika virus particles (colored purple in this scan) infecting cells. Each particle is about 40 nanometers in diameter. CDC/Smith Collection/Gado/Getty Images hide caption
A Case Of Zika Apparently Spread From A Patient To A Family Caregiver
Tuesday
Aedes aegypti mosquitoes, which have been known to carry the Zika virus, buzz in a laboratory in Cucuta, Colombia. Ricardo Mazalan/AP hide caption
'Nobody Is Immune': Bracing For Zika's First Summer In The U.S.
Friday
A screwworm larva grasps the flesh in a wound with its mouth's tusklike protrusions and screws itself in. Science Source hide caption
Wednesday
Mifeprex, formerly called RU-486, is the brand name of the abortion pill called mifepristone. Michelle Del Guercio hide caption
Monday
So far it looks like Zika virus doesn't pose the same neurological risk to small children as it does to fetuses in the womb. zhang bo/Getty Images hide caption
Tuesday
Would the threat of Zika lead you to rethink a scheduled trip to Ipanema beach or the Summer Olympics in Rio de Janeiro, Brazil? You'd need the right kind of travel insurance to cover the cost of a canceled trip. Mario Tama/Getty Images hide caption
Monday
Wednesday
Margaret Chan (left), director general of the World Health Organization, is among the dignitaries visiting a military base in Conakry, Guinea, on a tour of west African countries affected by Ebola. Also pictured: Guinean President Alpha Conde (fourth from right) and U.N. Secretary General Ban Ki-Moon (right). BINANI/AFP/Getty Images hide caption
Thursday
The Zika virus is spread by mosquitoes, but it can be sexually transmitted as well. Centers for Disease Control and Prevention hide caption
Wednesday
Angelica Pereira feeds her daughter Luiza, who was born with microcephaly, at her mother's house in Santa Cruz do Capibaribe, Brazil. Felipe Dana/AP hide caption
Zika Virus Can Cause Brain Defects In Babies, CDC Confirms
Sunday
Two-month-old Lara, who was born with microcephaly, is examined by a neurologist at the Pedro I hospital in Campina Grande, Paraiba state, Brazil, on Feb. 12. Felipe Dana/AP hide caption
Brazilian Doctor Crafts System Hailed As 'Way Forward' For Combating Zika
Saturday
A scientist examines mosquitoes at the lab. Walter Reed Army Institute of Research hide caption