The government has decided to prepare an action plan within the next three-four months to tackle dengue, chikungunya and Japanese encephalitis. According to Cabinet Secretary K M Chandrasekhar, under the action plan, the Ministries of Health and Family Welfare and Science and Technology will work together for the programme to develop vaccines for these mostly communicable diseases.The decision to focus on development of vaccines and other remedial actions comes against the backdrop of widespread fear created by dengue in the run-up to the October Commonwealth Games in Delhi. The country has so far reported 15,535 cases of dengue out of which 96 turned fatal.