What the First U.S. Chikungunya Virus Case Means: LSU Expert Breaks It Down

"It isn’t terribly surprising that we’d eventually have a case"

Oct 20, 2025

2 min

Rebecca Christofferson



"The main vector in the US, Aedes albopictus, is known to have been there so it isn’t terribly surprising that we’d eventually have a case.


The fact that is was a local transmission case – meaning that a mosquito transmitted it to someone who had not traveled outside the area – is a bit concerning and points to a couple of things:


We need more surveillance for these types of viruses; the fact that it got here means likely someone who had traveled brought it back from their vacation


The surveillance infrastructure via the CDC and federal funding has been gutted – which of course is problematic when we have these sorts of introductions occurring.


These types of mosquitoes go a little quiet in the fall/winter because it gets too cool for them to be as active as say the summertime. They’re lucky it’s in the fall and not at the start of summer, where the weather would be more conducive to MORE transmission. HOWEVER, as weather patterns change from a combination of climate change and urban development (which creates more heated areas), we’re going to see the times that these mosquitoes are more active becoming longer – which will again mean more opportunities for transmission.


Of course, in Louisiana, these mosquitoes are active for a lot of the year.


We have good mosquito control, but anyone who sits outside will tell you that doesn’t eliminate biting (though imagine if we didn’t have it) we need to stay vigilant and support the systems that protect us: mosquito abatement, federal and state surveillance, and the science and research that supports our ability to recognize and respond to outbreaks."


Dr. Christofferson's recent research publications in this area: 




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Rebecca Christofferson

Rebecca Christofferson

Associate Professor

Dr. Christofferson is an international expert on emerging zoonotic and mosquito-borne viruses.

Neglected Tropical DiseasesVirusesEpidemiologyInfectious DisasesBiosecurity
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