A recent study by the Centers for Disease Control and Prevention estimated that 5,900 to 10,300 pregnant women might get infected during the initial Zika outbreak in Puerto Rico. [...] Puerto Rico, like other parts of the Caribbean and Latin America, has the perfect mix of conditions for a mosquito borne virus to spread widely. Since the Zika virus was identified in Brazil, it has spread through most of the countries in the Western Hemisphere, Latin America and the Caribbean, including the continental United States. In areas without infrastructure to supply water to the entire population or with inappropriate waste management, people may store water in or near their homes or leave waste containers and tires uncovered. In Puerto Rico, as in other tropical areas, window and door screens and air conditioning aren’t as common as they are in the continental U.S.