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Climate adaptation: Zika virus carriers wintering in northeastern US

#1
C C Offline
http://www.sciencedaily.com/releases/201...091523.htm

RELEASE: Zika virus, a mosquito-borne illness that in the past year has swept quickly throughout equatorial countries, is expected to spread across the Americas and into the United States.

The disease, which was discovered in 1947 but had since been seen in only small, short-lived outbreaks, causes symptoms including a rash, headache and small fever. However, a May 2015 outbreak in Brazil led to nearly 3,500 reports of birth defects linked to the virus, even after its symptoms had passed, and an uptick in cases of Guillain-Barre syndrome, an immune disorder. The Centers for Disease Control and Prevention has issued a travel alert advising pregnant women to avoid traveling to countries where the disease has been recorded.

Zika virus is transmitted by the mosquito species Aedes aegypti, also a carrier of dengue fever and chikungunya, two other tropical diseases. Though Aedes aegypti is not native to North America, researchers at the University of Notre Dame who study the species have reported a discovery of a population of the mosquitoes in a Capitol Hill neighborhood in Washington, D.C. To add insult to injury, the team identified genetic evidence that these mosquitoes have overwintered for at least the past four years, meaning they are adapting for persistence in a northern climate well out of their normal range.

While the Washington population is currently disease-free, Notre Dame Department of Biological Sciences professor David Severson, who led the team, noted that the ability of this species to survive in a northern climate is troublesome. This mosquito is typically restricted to tropical and subtropical regions of the world and not found farther north in the United States than Alabama, Mississippi, Georgia and South Carolina.

"What this means for the scientific world," said Severson, who led the team, "is some mosquito species are finding ways to survive in normally restrictive environments by taking advantage of underground refugia. Therefore, a real potential exists for active transmission of mosquito-borne tropical diseases in popular places like the National Mall. Hopefully, politicians will take notice of events like this in their own backyard and work to increase funding levels on mosquitoes and mosquito-borne diseases."

Severson's research focuses on mosquito genetics and genomics with a primary goal of understanding disease transmission. He has studied and tracked mosquitoes all over the world and most recently served as the director of the Eck Institute for Global Health at Notre Dame. His team, in coordination with the Disease Carrying Insects Program of Fairfax County Health Department in Fairfax, Virginia, recently published their findings in the American Journal of Tropical Medicine and Hygiene.

Notre Dame has a long history of mosquito research, studying both Aedes aegypti and Anopheles gambiae species, vector control and using mathematical models to better understand the dynamics of infectious disease transmission and control. Alex Perkins, Eck Family Assistant Professor of Biological Sciences, focuses on using mathematical, statistical and computational approaches to study mosquito-borne pathogens including dengue, chikungunya and Zika. Perkins uses the models to understand how to best control and prevent transmission of these diseases. He has previously worked with the CDC on making recommendations for chikungunya and dengue virus, and said he has discussed working with the CDC on Zika virus modeling.
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#2
elte Offline
Now we can add Zika to West Nile. The mosquitoes are really bad where I live, and it can be too inconvenient to do much outside about after May begins. It used be that just about the only concern was meningitis and encephalitis until the tiger mosquito ended up here.
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#3
C C Offline
(Feb 1, 2016 03:08 PM)elte Wrote: Now we can add Zika to West Nile. The mosquitoes are really bad where I live, and it can be too inconvenient to do much outside about after May begins. It used be that just about the only concern was meningitis and encephalitis until the tiger mosquito ended up here.


I guess the recent Texas infection makes it official that it can be sexually transmitted, too. The pejorative term "pinhead" may unfortunately be resurrected in poor, vice neighborhoods where drugs and carnal commerce are abundant. If only that consequence of Zika could turn out to be as bogus as the "crack baby" myth was during the '80s and '90s. From the deluge of microcephaly cases in Brazil, little chance of that apparently.
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