A mosquito-born illness will affect almost everyone in Indonesia

Jentavery / Flickr

Officials in Indonesia might be underestimating the true extent of a severe, mosquito-born illness, according to a new study, because many cases go unreported, per the World Health Organization.

Dengue fever, also called breakbone fever, is a virus closely related to and carried by the same mosquitoes as Zika. Many cases are mild, but in some people dengue can cause extreme pain, fever, shock, and hemorrhaging, and the risk of severe consequences increases the more times someone is infected.

Why it matters: In some countries dengue is a leading cause of death in children, according to WHO.