Revellers parade for the Vai-Vai samba school during the carnival in Sao Paulo on Sunday. The worst health scare in recent history is not keeping Brazilians from their annual Carnival revelry, with millions of partiers swarming streets and some making fun of the mosquito that spreads Zika and other viruses. Street processions, block parties and the televised, big-budget parades are the hallmark of the festival which moved into the second day. REUTERS/Paulo Whitaker