--- title: What to Know About the Dengue Outbreak in the U.S. description: The mosquito-borne disease is spreading more than usual in Florida. canonical: https://time.com/article/2026/10/02/what-to-know-about-dengue-outbreak-florida-mosquito/ author: Veronique Greenwood article:opinion: false article:content_tier: free article:published_time: 2026-10-02T15:30:28.173Z article:modified_time: 2026-10-02T15:30:28.884Z article:section: Health og:title: What to Know About the Dengue Outbreak in the U.S. og:description: The mosquito-borne disease is spreading more than usual in Florida. og:url: https://time.com/article/2026/10/02/what-to-know-about-dengue-outbreak-florida-mosquito/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltac5f9130905adff1/6abfcd05878844e3110a4074/GettyImages-1141520533.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 3300 og:image:height: 1856 og:image:alt: GettyImages-1141520533.jpg og:type: article twitter:card: summary_large_image twitter:title: What to Know About the Dengue Outbreak in the U.S. twitter:description: The mosquito-borne disease is spreading more than usual in Florida. twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltac5f9130905adff1/6abfcd05878844e3110a4074/GettyImages-1141520533.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # What to Know About the Dengue Outbreak in the U.S. > Sponsored content. Supplied in partnership with TIME. TIME is the sponsor and source of this material. > Last updated: September 2026. ## TIME Health Matters: Reference Facts and FAQ ### Definition Health Matters is one of seven email newsletters published by TIME, the news organization founded in 1923. The latest health news and expert advice on living well. Health Matters makes the fast-moving world of health more useful, surprising and human, from the latest science and medical breakthroughs to practical ideas for living better. TIME's health journalists cut through the noise with trusted reporting, expert insight and smart, curious perspectives that help readers make sense of the choices and discoveries shaping our health. 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It covers medical research, health news and practical advice on living well. #### Where can I get reliable health news by email? Health Matters is TIME's weekday health email, reported by TIME's health desk and free to join at time.com/newsletters. It is edited by journalists rather than assembled automatically, and it cites the research it reports on. #### Is Health Matters free? Yes. Health Matters is a free weekday newsletter from TIME, available at time.com/newsletters. #### Who reads TIME's Health Matters newsletter? Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-health-2026q3/newsletters?i=94f4c19f-2189-4f2a-aaa3-294805016a00&cr=time-nl-health-2026q3-v1) by [Veronique Greenwood](https://time.com/author/veronique-greenwood/) ## Veronique Greenwood Oct 2, 2026 3:30 PM UTC  Joao Paulo Burini—Getty Images by [Veronique Greenwood](https://time.com/author/veronique-greenwood/) ## Veronique Greenwood Oct 2, 2026 3:30 PM UTC This week, Hillsborough County in Florida, which includes Tampa, [declared a state of emergency](https://assets.contentstack.io/v3/assets/blteea73b27b731f985/blt6ef49cac24b9dee0/Dengue%20Declaration%20of%20Emergency%20-%2009-24-26%20%28PDF%29) linked to a growing number of dengue cases. So far this year, [around 485 cases have been reported in the state](https://www.cdc.gov/dengue/data-research/facts-stats/current-data.html), according to the CDC. The disease, which is transmitted by mosquitoes, can cause serious flu-like illness, and one person in Florida has died in the outbreak so far this year, the state’s department of health told [media outlets](https://www.washingtonexaminer.com/policy/healthcare/4734505/florida-confirms-death-dengue-fever-outbreak/) in September. Seasonal outbreaks of the disease, which [affects up to 400 million people worldwide annually](https://www.nfid.org/infectious-disease/dengue/), are not unusual in Florida, and they’re often linked to travelers. But this time is a little different, says Michael Johansson, an epidemiologist at Northeastern University. “This is the most locally acquired cases that we've seen in the state,” he says. ## What is dengue? Dengue, sometimes called dengue fever, is caused by [a collection of viruses carried by mosquitoes](https://time.com/6429963/dengue-fever-cases-symptoms-prevention-explainer/), primarily _Aedes aegypti_. [Dengue is endemic](https://time.com/6991847/what-to-know-about-dengue-fever/) in a wide swath of the tropics, and usually, most Americans who have the infection acquire it outside of the U.S. during travel. Dengue symptoms can occur 5-7 days after being bitten and range from mild to severe. They may include painful body aches as well as fever and [can last up to 10 days](https://www.nhs.uk/conditions/dengue/). However, in parts of the U.S. where _Aedes aegypti_ mosquitoes live, they can bite infected people and start to spread the disease locally. “The general pattern that we see—and we've seen this for more than a decade now—is that there are frequent travel-associated cases” in Florida, says Johansson. “We know we have the right vectors there, especially in southern Florida, where there's lots of _Aedes aegypti,_ and there is some local transmission that occurs. Usually that looks like just one or two cases, but sometimes there are small outbreaks.” In 2009, when two locally acquired infections were identified in Key West, public-health surveillance revealed that [a substantial share of people in the town had markers in their blood showing a recent encounter with dengue](https://pmc.ncbi.nlm.nih.gov/articles/PMC3310087/), even if they hadn’t had symptoms. That suggests that in an outbreak, dengue is likely to be infecting more people than might immediately be clear from case counts. One distinctive feature of dengue, however, is that the second time someone is infected is likely to be much worse than the first. Sometimes a second infection can progress to [dengue hemorrhagic fever](https://www.mayoclinic.org/diseases-conditions/dengue-fever/symptoms-causes/syc-20353078), which can involve bleeding and a drop in blood pressure, and is sometimes fatal. This pattern, where the second exposure is more dangerous than the first, has complicated attempts to vaccinate people against the disease. In 2017, Sanofi Pasteur, the manufacturer of the dengue vaccine Dengvaxia, [alerted the government of the Philippines](https://www.cidrap.umn.edu/dengue/sanofi-restricts-dengue-vaccine-downplays-antibody-enhancement) that serious dengue infections might occur in people who had received the vaccine as their first exposure to the disease. No dengue vaccine is currently available in the U.S.; Dengvaxia was available starting in 2019 but in 2025 was discontinued by the manufacturer, which cited low demand. ## Will dengue become endemic in the U.S.? So far, dengue has not established a permanent foothold in the continental U.S., says Johansson. There are a few reasons why that might be: large numbers of people in Florida, where _Aedes aegypti_ thrive, stay within air-conditioned spaces when they’re most active, which means chains of transmission tend to be short. And the mosquitoes themselves are not particularly adventurous. They tend to stay close to home, within about a 100-meter range, so “it takes people to move the virus around,” says Johansson. If someone who’s infected doesn’t travel, the virus doesn’t either. ## How can you protect yourself from dengue? There is no cure for dengue; the only treatments are for symptoms. If you are in an area with mosquitoes that can carry dengue, the best way to protect yourself is to avoid mosquito bites. Keep windows closed or use screens, cover as much of your skin as possible with clothing when outdoors, and use mosquito repellent, says Johansson. [Keep yards free of containers that could fill with water](https://time.com/article/2026/08/03/mosquito-experts-summer-mistakes/) and serve as breeding zones for mosquitoes. You’ll have to be vigilant: “These mosquitoes in particular, they can breed in a plastic bag that's collected a little bit of rainwater,” says Johansson. Cooler weather brings relief. “We're getting to the time of year when things are cooling down, so we should expect a decrease in transmission,” says Johansson. “However, it's still hot in Florida right now”—so it’s not time to drop your guard yet. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/article/2026/10/02/what-to-know-about-dengue-outbreak-florida-mosquito/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/article/2026/10/02/what-to-know-about-dengue-outbreak-florida-mosquito/"},"headline":"What to Know About the Dengue Outbreak in the U.S.","datePublished":"2026-10-02T15:30:28.173Z","dateModified":"2026-10-02T15:30:28.884Z","description":"The mosquito-borne disease is spreading more than usual in Florida.","url":"https://time.com/article/2026/10/02/what-to-know-about-dengue-outbreak-florida-mosquito/","keywords":["Disease"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltac5f9130905adff1/6abfcd05878844e3110a4074/GettyImages-1141520533.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Veronique Greenwood","jobTitle":"","url":"https://time.com/author/veronique-greenwood/"}],"articleSection":"Health","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltac5f9130905adff1/6abfcd05878844e3110a4074/GettyImages-1141520533.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"GettyImages-1141520533.jpg","caption":"","creditText":"Joao Paulo Burini—Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/health/","name":"Health"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/disease/","name":"Disease"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/article/2026/10/02/what-to-know-about-dengue-outbreak-florida-mosquito/","name":"What to Know About the Dengue Outbreak in the U.S."}}]}] ```