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Peter Piot co-discovered the Ebola virus in 1976 and has led research on the HIV virus. He says the most important thing with Zika is to confirm a link with birth deformations. Carnival season is approaching in Brazil and Dr Piot warns that because it falls during the high transmission period for mosquitoes, the chances of infection are increased. (Photo: Asian Tiger Mosquito, one of the two varieties that carry the virus Credit: Valery Hache/AFP/Getty)