Dengue continues to rise in Florida, and health officials worry that many infections are not being reported.

The article says mosquito-borne illness is spreading through southern counties and prompting emergency steps.

Three southern counties declared states of emergency so they could expand mosquito control.

Confirmed infections reached 170 in one main affected district, the article says.

Health agencies expanded larvicide spraying and public warnings as the case count climbed.

Many infected people have mild or no symptoms, which the article says leaves official totals short of real spread.

Residents are urged to dump standing water and to use insect repellent registered with the EPA.

Officials say weather and mosquito-control results will decide if more counties declare emergencies.

Read the full story on Florida’s dengue rise, the emergency declarations, and the 170 infections.