Mosquito season is getting longer, which could lead to more disease. How one city is preparing.

A warmer climate means mosquito season is getting longer, prompting not only an increase in the pesky insects but also greater potential for them to spread diseases like West Nile virus. 

To help reduce the risk In New York City, expert "insect hunters" track the summer pests among the trees and marshes of parks that residents use to escape the summer heat.

Vector ecologist Zurina Yusoff kills mosquito eggs with a bulky pellet sprayer strapped to her back, while co-worker Hamiltan Simean lays overnight traps for adult mosquitoes. The mosquitoes are then delivered to the public health lab for testing and are sorted by mosquito species.