Specimens are labeled and entered at the Centers for Disease Control laboratory in San Juan, Puerto Rico, where they will be tested for the Zika virus. Right now, Zika is spreading rapidly in Puerto Rico and pregnant women are at risk for becoming infected with Zika which can cause microcephaly and other birth defects. If the current trends continue, at least 1 in 4 people, including women who become pregnant, may become infected with Zika.