A health worker fumigates an area in Gama, Brazil, to combat the Aedes aegypti mosquito on Wednesday, February 17. The mosquito carries the <a href="http://www.cnn.com/specials/health/zika" target="_blank">Zika virus,</a> which has suspected links to birth defects in newborn children. The World Health Organization expects the Zika outbreak to spread to <a href="http://www.cnn.com/2016/01/25/health/who-zika-virus-americas/index.html" target="_blank">almost every country in the Americas.</a>