Pakistani patients, suffering from the mosquito-borne disease, dengue fever, lay in beds covered with nets at an isolation ward of a hospital in Rawalpindi, Pakistan, Thursday, Oct. 24, 2013. Dengue, a flu-like illness, is spread by the Aedes mosquito and spikes during the annual monsoons in Pakistan, when the rains leave puddles of stagnant water where the insects breed.

Muhammed Muheisen/AP

Patients suffering from the mosquito-borne dengue fever in an isolation ward at a hospital in Rawalpindi, Pakistan. The disease is particularly prevalent during the monsoon season