ILOILO CITY: ASEAN countries have a common disease enemy and this is dengue, pointed out Health Secretary Janette P. Loreto-Garin. She said dengue is transmitted in 100 tropical countries, including the Philippines, with close to 100 million presenting with symptoms of mild or severe disease. Garin advised health workers and local government units to plan ahead instead of just responding to dengue outbreaks as the Philippines. Dengue is transmitted by the bite of a mosquito infected with one of the four dengue virus serotypes. It affects infants, young children and adults.