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Florida dengue outbreak worst in decades in US

Florida’s current dengue outbreak appears to be the largest in several decades in the continental United States.

State health officials reported this week that more than 250 locally acquired cases of the mosquito-borne disease have been tallied so far this year. The vast majority of them were in Hillsborough County, home to Tampa.

Federal health officials say their data on dengue outbreaks is limited. But available information from state health departments and medical journals suggests the Florida outbreak marks the most cases in a calendar year for any state since at least the 1940s.

Puerto Rico is consistently hit hard by dengue, with numbers much higher than what’s seen in any of the 50 states. But in the continental U.S., Florida usually gets the most locally transmitted cases. The state’s previous worst year was 2023, when just under 200 locally spread cases were reported.

Officials in Hillsborough and surrounding counties have declared local emergencies, and workers in the Tampa area are spraying day and night to tamp down the population of disease-transmitting mosquitoes.

Dengue (pronounced DEHN’-gay) is caused by a virus spread by a type of mosquito.

Many infected people don’t get sick, but some experience fever, flu-like symptoms and — notoriously — aches. It’s been nicknamed “breakbone fever” for the excruciating pain some people experience. Severe cases can cause bleeding, shock and death.

There has been one dengue death in Florida this year — an elderly Tampa woman on Sept. 4.

The warm-weather mosquitoes that spread dengue live in Florida and some other hotter U.S. locales, but experts say they have been expanding their geographic reach because of climate change.

For decades, most continental U.S. infections were found among people who caught the virus while traveling internationally, along with locally acquired cases in Puerto Rico.

But in 2009-2010, Key West, Florida, reported the first dengue cases acquired in the continental U.S. outside of the Texas-Mexico border since 1945.

The largest outbreak of dengue in any U.S. state since then occurred in Hawaii, where 264 locally acquired cases were reported over a six-month span in 2015-2016. The Tampa-area outbreak, which first came to light in July, is already on the verge of surpassing that.

Across the world, more than 2.2 million infections and nearly 1,200 deaths have been reported this year, according to the World Health Organization.

There have been nearly 1,900 locally acquired U.S. cases this year, most of them in Puerto Rico, according to the Centers for Disease Control and Prevention.

Traditionally, the CDC would be highly visible in a situation like this, but it hasn’t been this time, Wesson noted.

The U.S. public health agency has to be invited in by state officials, however, and Florida officials have not asked for CDC disease investigators to come in, CDC spokesman Jason McDonald said. The agency has provided $800,000 in assistance to the state health department, he added.


(James Gathany/Centers for Disease Control and Prevention via AP, File)
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