A man welcomes blasts of artificial snow sprayed on revelers as they dance at the Bicho Maluco Beleza street carnival block party in Sao Paulo, Brazil, Saturday, January 30, 2016. Brazil's over-the-top Carnival is the highlight of the year for many local residents. Hundreds of thousands of merrymakers are taking to the streets in hundreds of open-air “bloco” parties, leading up to Carnival's official February 5th opening. (Photo by Andre Penner/AP Photo)





A reveller takes part in an annual block party known as “Ceu na Terra” (Heaven on Earth), one of the many carnival parties to take place in the neighbourhoods of Rio de Janeiro, January 30, 2016. (Photo by Pilar Olivares/Reuters)





A reveller takes part in an annual block party known as “Ceu na Terra” (Heaven on Earth), one of the many carnival parties to take place in the neighbourhoods of Rio de Janeiro, January 30, 2016. (Photo by Pilar Olivares/Reuters)





Revellers take part in an annual block party known as “Ceu na Terra” (Heaven on Earth), one of the many carnival parties to take place in the neighbourhoods of Rio de Janeiro, January 30, 2016. (Photo by Pilar Olivares/Reuters)





Revellers take part in an annual block party known as “Ceu na Terra” (Heaven on Earth), one of the many pre-carnival parties to take place in the neighbourhoods of Rio de Janeiro, Brazil, January 30, 2016. (Photo by Ricardo Moraes/Reuters)





Pieces of costumes hang on the entrance of a house during an annual block party known as “Ceu na Terra” (Heaven on Earth), one of the many pre-carnival parties to take place in the neighbourhoods of Rio de Janeiro, Brazil, January 30, 2016. (Photo by Ricardo Moraes/Reuters)





Revellers take part in an annual block party known as “Ceu na Terra” (Heaven on Earth), one of the many pre-carnival parties to take place in the neighbourhoods of Rio de Janeiro, Brazil, January 30, 2016. (Photo by Ricardo Moraes/Reuters)





A reveller holds up a spray representing an insecticide against the Aedes aegypti mosquito, as she takes part in an annual block party known as “Ceu na Terra” (Heaven on Earth), one of the many pre-carnival parties to take place in the neighbourhoods of Rio de Janeiro, Brazil, January 30, 2016. (Photo by Ricardo Moraes/Reuters)





Revellers dance during pre-Carnival celebrations on January 30, 2016 in Recife, Pernambuco state, Brazil. Health officials believe as many as 100,000 people have been exposed to the Zika virus in Recife, although most never develop symptoms. Carnival celebrations are continuing normally as planned. In the last four months, authorities have recorded around 4,000 cases in Brazil in which the mosquito-borne Zika virus may have led to microcephaly in infants. The ailment results in an abnormally small head in newborns and is associated with various disorders including decreased brain development. According to the World Health Organization (WHO), the Zika virus outbreak is likely to spread throughout nearly all the Americas. (Photo by Mario Tama/Getty Images)





Revellers take part in the annual carnival block party known as “Casas comigo” or “Marry me” at the Pinheiros neighborhood in Sao Paulo, Brazil, January 30, 2016. (Photo by Nacho Doce/Reuters)





Revellers wait outside portable toilets as they take part in the annual carnival block party known as “Casas comigo” or “Marry me” at the Pinheiros neighborhood in Sao Paulo, Brazil, January 30, 2016. (Photo by Nacho Doce/Reuters)





Revellers urinates on a street in the annual carnival block party known as “Casas comigo” or “Marry me” at the Pinheiros neighborhood in Sao Paulo, Brazil, January 30, 2016. (Photo by Nacho Doce/Reuters)





A reveller takes part in the annual carnival block party known as “Casas comigo” or “Marry me” at the Pinheiros neighborhood in Sao Paulo, Brazil, January 30, 2016. (Photo by Nacho Doce/Reuters)





Revellers are reflected in a balloon as they pose for a photo while taking part in the annual carnival block party known as “Casas comigo” or “Marry me” at the Pinheiros neighborhood in Sao Paulo, Brazil, January 30, 2016. (Photo by Nacho Doce/Reuters)





Revellers take part in the annual carnival block party known as “Casas comigo” or “Marry me” at the Pinheiros neighborhood in Sao Paulo, Brazil, January 30, 2016. (Photo by Nacho Doce/Reuters)





A reveller, wearing a mask depicting Brazilian President Dilma Rousseff, takes part in a block street party known as “Lava Jato” (Car Wash) during carnival celebrations in Sao Paulo, Brazil, January 30, 2016. “Lava-Jato”, or “Operation Car Wash”, is the name of a federal police operation investigating suspected corruption at state oil company Petrobras. (Photo by Paulo Whitaker/Reuters)