Rio de Janeiro, Brazil, 18 February 2016: The Brazilian government has intensified the fight against mosquitoes aedes aegypti, the Zika virus transmitter, but much remains to be done. The railroad tracks crossing the whole town and passing near the venues that will be used in the 2016 Olympic Games, are full of garbage that are accumulating rainwater. Rio's passenger trains are administrated by SuperVia, which is the company responsible for system operation. Credit: Luiz Souza/Alamy Live News

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