Dengue is a mosquito-borne disease and the female Aedes aegypti is known to transmit the dengue virus. The World Health Organisation (WHO) estimates over 400 million people get infected with the dengue virus every year. This calls for immediate attention to the body and the surroundings. New Delhi: The onset of winter is the time when the body is most vulnerable to falling victim to seasonal illnesses. The national capital, Delhi has crossed the 1000 mark signifying the threat of this mosquito-borne disease.