FILE- A health ministry worker discharges anti-mosquito spray as a preventive measure to control dengue fever, in Sidoarjo, East Java, Indonesia, in this file photo dated Thursday, March 14, 2013. According to new research published online Sunday April 7, 2013, in the journal Nature, the number of infected cases is around 390 million, nearly four times as many people infected with the tropical disease than was previously believed, although many develop a mild form of the illness and don’t need medical attention. (AP Photo/Trisnadi, File)

Associated Press
FILE- A health ministry worker discharges anti-mosquito spray as a preventive measure to control dengue fever, in Sidoarjo, East Java, Indonesia, in this file photo dated Thursday, March 14, 2013.  According to new research published online Sunday April 7, 2013, in the journal Nature, the number of infected cases is around 390 million, nearly four times as many people infected with the tropical disease than was previously believed, although many develop a mild form of the illness and don’t need medical attention. (AP Photo/Trisnadi, File)
FILE- A health ministry worker discharges anti-mosquito spray as a preventive measure to control dengue fever, in Sidoarjo, East Java, Indonesia, in this file photo dated Thursday, March 14, 2013. According to new research published online Sunday April 7, 2013, in the journal Nature, the number of infected cases is around 390 million, nearly four times as many people infected with the tropical disease than was previously believed, although many develop a mild form of the illness and don’t need medical attention. (AP Photo/Trisnadi, File)
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