Revelers wearing Greek style costumes raise awareness of the need to prevent the spread of the Zika virus in the first carnival ”Bloco” (street parade group) under the theme ”Rio: The Olympics are here” on the streets of Rio de Janeiro, Brazil on January 23, 2016. AFP PHOTO/Christophe SIMON / AFP / CHRISTOPHE SIMON (Photo credit should read CHRISTOPHE SIMON/AFP/Getty Images)