A line of men in black rain boots push trash carts through the alleys of Lahore, Pakistan. They stop at an open sewer along a neighborhood street and start to pull up shoes, bricks, plates and any other trash that might block the flow of wastewater.
Standing water is a prime breeding ground for mosquitoes. And the local government in Lahore is on a focused mission: Stop the spread of dengue fever by mosquitoes.
A new paper in the journal Nature says scientists have been seriously underestimating the amount of dengue around the globe.
The study says there could be as many as 400 million dengue infections worldwide each year making it more prevalent than malaria. This is four times higher than the current dengue prevalence estimate of the World Health Organization.