HEAT EFFECTS: High temperatures might shorten the life cycle of vector mosquitoes, and could also reduce the time for the dengue virus to replicate in mosquitoes, the CDC said By Lee I-chia / Staff reporter People should be vigilant in preventing mosquito bites, as El Nino, forecast to be strong this year, might increase the risk of dengue outbreaks, the Centers for Disease Control (CDC) said yesterday.Eighty-three cases of dengue fever had been reported this year as of Monday, comprising seven locally acquired cases, all of which which were in Kaohsiung, and 76 imported cases, all of which were from Southeast Asia or South Asia, CDC Deputy Director-General and spokeswoman Tseng Shu-hui (曾淑慧) said.The US National Oceanic and Atmospheric Administration on June 11 said that El Nino had devel