If you live in Palm Beach or Miami-Dade County, you already know your county has an active mosquito-borne illness alert. What's changed in the last three weeks is where else that list is spreading. Pinellas County issued its own advisory on August 11 after two confirmed cases of locally-acquired dengue (Source: DOH-Pinellas, Aug 11, 2026). The day after that, Hillsborough County confirmed its eighth locally-acquired dengue case and said the county remains under alert (Source: DOH-Hillsborough, Aug 12, 2026). Pasco County updated its own advisory again as recently as August 26, this time for a newly confirmed human case of dengue (Source: DOH-Pasco, Aug 26, 2026). Miami-Dade's alert traces back to a confirmed locally-acquired case reported August 3 (Source: DOH-Miami-Dade, Aug 3, 2026). Statewide, WLRN's August 20 roundup counted six counties with active mosquito-borne illness alerts, Alachua, Leon, Palm Beach, Pasco, Hillsborough, and Miami-Dade (Source: WLRN, Aug 20, 2026). Pinellas's August 11 advisory doesn't appear on that later statewide list, so we're not counting it as currently active, six is the number the most recent roundup supports.
Why this matters even if you're not in an alert county
Most of the case growth over the last few weeks has been on Florida's west coast, not here. But the pattern is the point. This isn't one county with one outbreak that gets cleared up and the story ends. It's a rolling list that adds counties as the season goes on, and South Florida has been on it since the first week of August. Palm Beach and Miami-Dade residents don't need to wait for a new headline to take this seriously. The alert covering your county has been active for weeks already.
It's also worth being precise about what these numbers mean, because it gets muddled in casual conversation. A "locally-acquired" case means someone caught dengue from a mosquito bite here in Florida, without having traveled anywhere. That's a different, more serious signal than a travel-associated case, where someone picked up the virus abroad and brought it home. Every case cited above is one the health department itself labeled locally-acquired, except the newest Pasco case, where the county's own advisory didn't specify which category it falls into. That distinction matters, and it's exactly why we don't round numbers up or guess at categories that aren't stated.
What actually reduces your risk
None of this requires a change in behavior from what's already sound practice during South Florida's rainy season:
- Dump standing water weekly, not just after a storm. The dengue vectors Florida health departments name, Aedes aegypti and Aedes albopictus, breed in container-sized amounts of water: a clogged gutter, a saucer under a plant, a bucket left in the yard.
- Use an EPA-registered repellent during the day. This species bites aggressively in daylight hours, not just at dusk like people expect from mosquitoes generally. DEET, picaridin, oil of lemon eucalyptus, IR3535, and para-menthane-diol are the actives with real evidence behind them.
- Check window and door screens. Florida DOH's own guidance keeps coming back to this basic point: a torn screen undoes everything else you're doing right.
- Don't assume your county is exempt because it's not in this week's headline. Six counties were on the most recent statewide roundup (Aug 20), and more counties were added over the preceding three weeks than were removed.
Where professional coverage fits
Weekly water checks handle what's in your own yard. They don't reach a neighbor's uncut lot, a storm drain, or a canal edge, and those gaps matter more the longer this season runs. A barrier treatment kills adult mosquitoes on contact and holds up roughly 10 to 17 days, which is why it's applied on a recurring schedule instead of once. To be clear about what that product is: it's an EPA-registered control product, not a natural one, and it works because it kills on contact. Some service programs pair it with an In2Care-style device, which is natural-based and works differently, using mosquitoes themselves to carry a larvicide back to breeding sites a spray never touches. Neither one replaces dumping the water you can see.
Sources: Florida Department of Health in Pinellas County, "DOH-Pinellas Issues Mosquito-Borne Illness Alert," Aug 11, 2026; Florida Department of Health in Hillsborough County, "DOH-Hillsborough County Issues Mosquito-Borne Illness Alert Update," Aug 12, 2026; Florida Department of Health in Pasco County, "DOH-Pasco Issues Updated Mosquito-Borne Illness Advisory," Aug 26, 2026; Florida Department of Health in Miami-Dade County, "DOH-Miami-Dade Issues Mosquito-Borne Illness Alert," Aug 3, 2026; WLRN, "A look at where mosquito health alerts are in effect across Florida," Aug 20, 2026.
Sources are cited inline. Questions about your own property? Call 561-443-3333 or request a free quote.