Before the virus overwhelmed Puerto Rico, Zika already lurked in Keishla Mojica's home in Caguas.
First her partner, John Rodríguez, 23, became infected. His face swelled and a red, itchy rash covered his body. Doctors at the time diagnosed it as an allergy.
Two months later, Mojica, 23, had the same symptoms. Medics administered shots of Benadryl to soothe the rash and inflammation. She didn't give it much more thought.