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MEDICAL: DISEASES: ZIKA VIRUS :
ENVIRONMENT GLOBAL WARMING AND CLIMATE CHANGE:
Higher Temperatures Make Zika More Likely to Spread
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Higher Temperatures Make Zika More Likely to Spread
CBS
Associated Press (AP)
February 4, 2016, 6:33 AM
http://www.cbsnews.com/news/
higher-temperatures-make-zika-more-likely-to-spread/
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A shorter URL for the above link:
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http://tinyurl.com/jktwrz4
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The mosquito behind the Zika virus seems to operate like a heat-driven
missile of disease. The hotter it gets, the better the mosquito that
carries Zika virus is at transmitting its buffet of dangerous illnesses,
scientists say.
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Although it is too early to say for this outbreak, past outbreaks of
similar diseases involved more than just biology. In the past, weather has
played a key role, as have economics, human travel, air conditioning and
mosquito control. Even El Nino sneaks into the game. Scientists say you
can't just blame one thing for an outbreak and caution it is too early to
link this one to climate change or any single weather event.
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As the temperature rises, nearly everything about the biology of the Aedes
aegypti mosquito -- the one that carries Zika, dengue fever and other
diseases -- speeds up when it comes to spreading disease, said
entomologist Bill Reisen of the University of California Davis.
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"With higher temperatures you have more mosquitoes feeding more frequently
and having a greater chance of acquiring infection. And then the virus
replicates faster because it's hotter, therefore the mosquitoes can
transmit earlier in their life," Reisen said. The thermodynamics of
mosquitoes are "driven by temperature."
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The hotspots for this Zika outbreak also have been temperature and drought
hotspots recently. Recife, Brazil, the largest city in the Zika-struck
region, saw its hottest September-October-November on record, about 1.2
degrees Celsius (2.2 degrees Fahrenheit) above normal, according to NASA
data. The state of Pernambuco had its hottest and driest year since 1998,
according to the state weather agency. And globally, last year was the
hottest on record.
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Scientists have studied Zika far less than other mosquito-borne diseases,
so for guidance they often look at dengue fever or chikungunya, which are
transmitted by the same species of mosquito. Dengue infects as many as 400
million people a year, with a quarter of them sick enough to be
hospitalized.
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Zika was just declared a global public health emergency after being linked
to brain deformities in babies in South America. Several thousand cases of
microcephaly have been reported in Brazil since October, although
researchers have so far not proven a definitive link to the virus. No
vaccine exists for Zika.
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The complete article may be read at the URL above.
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Sincerely,
David Dillard
Temple University
(215) 204 - 4584
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