Experts and the World Health Organization is warning that the Zika virus, native to Africa but spreading rapidly in Latin America, has “explosive pandemic potential” and may ultimately affect up to four million people, significantly eclipsing the number of cases in the 2014-2016 West Africa Ebola outbreak. “The level of alarm is extremely high, as is the level of uncertainty. Questions abound,” the head of the World Health Organization (WHO), said in a briefing Wednesday. “We need to get some answers quickly.” She noted that the greatest danger for its spread is that humans contract the virus through mosquito bites. “The mosquito is ubiquitous,” she warned, “You don’t need to travel to get the disease.” Marcos Espinal, head of communicable diseases and health analysis for the WHO’s regional satellite, the Pan American Health Organization, told reporters, “we can expect 3 to 4 million cases of Zika virus disease.” Experts base their estimates on the populations that live in habitats favorable to the Aedes aegypti mosquito, which is known to spread Zika, Dengue fever, Chikungunya, and Yellow fever. The Washington Post notes that some models have estimated that up to 200 million people in the United States alone live in Aedes aegypti territory. The WHO’s warnings follow the publication