In the Rio Grande Valley, where Texas meets Mexico along the Gulf, a mosquito-borne illness that had until now arrived only with travelers has taken root at home. Cameron County's first locally acquired dengue infection of 2024 marks a turn in a year that has already brought Texas its heaviest dengue count in two decades, with one death recorded. It is a reminder that the old pattern of disease crossing borders in human bodies can, in a changing world, begin again in the quiet of a backyard puddle.
Texas Reports First Locally Acquired Dengue Case of 2024, in Cameron County
One death from dengue has been reported statewide so far this year.
The virus was caught at home.
Mark
Why is one case in Cameron County getting this much attention?
Mimi
Because it changes the category. Every dengue case in Texas this year had been in a traveler. This one was caught locally, so the virus got into the mosquito-and-person cycle inside the state.
Luke
Worth being exact, though: the reporting says one locally acquired case. It doesn't say there's ongoing local spread, and it doesn't say how this person was infected.
Mark
And the broader numbers?
Mimi
106 cases and one death statewide, the highest in more than 20 years, according to the state health department.
Luke
That's the state's count. The CDC's 745 travel cases is a national figure as of late June, so the two shouldn't be compared directly.
Mark
West Nile was found too. Is that related?
Mimi
Same county, same kind of mosquito-borne threat, similar symptoms. But two separate viruses.
Luke
Nothing in the reporting links the three cases to each other.
Mark
What should residents do?
Mimi
Drain standing water, use repellent, and remember dengue mosquitoes usually bite during the day, so dusk-and-dawn advice isn't enough.
Il Polso
- A dengue infection caught inside Cameron County breaks a pattern that held all year, when every Texas case had been brought in by a traveler.
- Texas now counts 106 dengue cases and one death, its worst year in more than twenty, and the state's health department is calling 2024 highly active worldwide.
- Health workers are trapping mosquitoes, testing them for disease, and coordinating spraying with local cities wherever a suspected case was reported.
- Residents are being urged to drain standing water, wear protective clothing, use DEET or similar repellents, and stay indoors at dusk and dawn.
- West Nile has also turned up locally in the county, so the response now covers two mosquito-borne threats at once.
In the Rio Grande Valley, where Texas meets Mexico along the Gulf, a mosquito-borne illness that had until now arrived only with travelers has taken root at home. Cameron County's first locally acquired dengue infection of 2024 marks a turn in a year that has already brought Texas its heaviest dengue count in two decades, with one death recorded. It is a reminder that the old pattern of disease crossing borders in human bodies can, in a changing world, begin again in the quiet of a backyard puddle.
On a Thursday, officials in Cameron County reported three locally acquired mosquito-borne infections: two cases of West Nile virus and one of dengue. Days later, the Texas Department of State Health Services confirmed what made that dengue case weigh heavier. It was the first locally acquired dengue infection in Cameron County, and the first anywhere in Texas this year. Every earlier case in the state had been caught by someone who had traveled elsewhere. This one was caught at home, in the Rio Grande Valley, a border region shaped by its nearness to Mexico and the Gulf.
The year has been unusual. Texas has logged 106 dengue cases and one death, its highest count in more than twenty years. Federal health officials had warned over the summer that the Americas had already seen twice the dengue cases of all of 2023 by mid-year, and hundreds of American travelers had carried the virus home. Dengue and West Nile both travel by mosquito bite and not person to person, and they share many symptoms, though dengue can bring pain behind the eyes. Most people recover within two weeks, but a minority fall seriously ill, and only about a quarter of those infected ever show symptoms at all.
County health administrator Esmeralda Guajardo described the response now underway. Workers are tracing each report back to its source, coordinating spraying with municipalities, and trapping mosquitoes to learn which species are present and whether they carry disease. Her message to residents was simpler: remove the places where mosquitoes breed. Health officials also recommend repellents with DEET, picaridin, or oil of lemon eucalyptus, permethrin for clothing, and protective dress outdoors. Because dengue-carrying mosquitoes usually bite during the day, the advice to stay in at dusk and dawn is only part of the picture. What comes next depends on the county's trapping and spraying, and on how many households act on the water in their own yards.
Cameron County Public Health officials said on a Thursday that they had found three locally acquired mosquito-borne infections: two cases of West Nile virus and one of dengue. Then, on Monday, the Texas Department of State Health Services added a detail that raised the stakes. The dengue case was the first locally acquired one in Cameron County, and the first in the entire state this year.
The distinction matters because of how every earlier case in Texas had arrived. Until this one, the state's dengue infections had all been picked up by travelers. This case was different: the virus was caught at home. Cameron County sits in the Rio Grande Valley, bordering Mexico and the Gulf of Mexico.
It comes in an unusual year. The state health department said in a media release that 2024 has been highly active for dengue worldwide. Texas has recorded 106 dengue cases and one death so far this year, its highest count in more than 20 years.
The Centers for Disease Control and Prevention flagged the trend over the summer. Its alert said that in the first half of 2024, countries in the Americas had already reported twice as many dengue cases as in all of 2023. By late June, 745 cases had been identified in U.S. travelers.
West Nile and dengue share a good deal. Both spread through mosquito bites, and neither passes from person to person. A mosquito that bites someone with the virus in their blood can transmit it after an eight- to ten-day incubation period inside the insect. Symptoms overlap: high fever, headache, joint pain, muscle and bone pain, nausea, vomiting and rash. Dengue can also bring pain behind the eyes, while West Nile may cause swollen lymph nodes and a sore throat. A Cameron County release said most people recover fully within two weeks, though some develop complications that need medical attention and can be fatal if untreated.
The state release said only about a quarter of people infected with dengue develop symptoms, and roughly 5% of those symptomatic people may become seriously ill.
Cameron County Health Administrator Esmeralda Guajardo described the response. When the department receives a report of a possible mosquito-borne illness, it works with municipalities to coordinate spraying where the report originated. It also traps mosquitoes to identify the species present and test whether they carry disease. Guajardo urged residents to take their own steps too, saying it is important to eliminate breeding sites.
The health department advised using repellent containing DEET, picaridin or oil of lemon eucalyptus on exposed skin and clothing, and permethrin on clothing only, always following label instructions. It also recommended dressing protectively outdoors, draining all standing water at home, and staying inside at dusk and dawn, when infected mosquitoes are active. One caveat: mosquitoes carrying dengue usually bite during the day.
With the first local dengue case now confirmed, the county's trapping and spraying work, and residents' own habits around standing water and repellent, are the things to watch.
Citazioni salienti
It's important that residents take proactive steps to eliminate breeding sites.— Esmeralda Guajardo, Cameron County Health Administrator
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