A worker stores abandoned tyres, to remove potential breeding spots for mosquitoes transmitting Zika and other mosquito-borne diseases, at a temporary collection center in San Juan January 27, 2016. Puerto Rico is to release a report on Zika cases on the island this week which will show that around 18 cases are confirmed, the U.S. territory's health secretary Ana Rius told reporters on Tuesday. REUTERS/Alvin Baez