Dengue fever is spreading fast in the southern tip of India. Tamil Nadu ranked second in the country with 3,259 cases and two deaths in 2017 so far, compared to 2,500 cases and five deaths last year.

Its neighbor, Kerala, is not far behind. Seven out of 10 dengue cases reported in the country are registered in these two states, according to the National Vector-Borne Disease Control Programme.

Outbreaks have been linked to water stored in large tanks, which could have contributed to a significant increase in the mosquito population in Chennai and its neighboring cities.

Due to water shortages in most parts of Tamil Nadu, people often store what they will need in large containers, which facilitates mosquito breeding. 

Coimbatore, Pollachi, Udumalpet, Palani, Theni, Kadaiyanallur, Kanyakumari and Sankarankoil were reported to be the worst affected areas.