China has declared war on the chikungunya virus. How much of a threat is it?

A worker uses a sprayer to eradicate mosquitos at a park in order to prevent the spread of mosquito-borne disease Chikungunya in Guangdong Province of China.

The mosquito-borne disease is sweeping through a province in southern China, which is taking strict measures to quash the outbreak.

(Image credit: Visual China Group)