Calcutta Tribune: The “bad M” is back. Mosquito-borne diseases have returned to the city with a vengeance after a brief lull in the past couple of years. Hundreds of people have fallen prey to malaria, dengue, chikungunya and Japanese encephalitis and 17 lives have already been lost this season. According to the state health department, more than 60 per cent of cases of vector-borne diseases in West Bengal are in Calcutta and its fringes. Experts predict that in the next few years, such diseases will …