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As summer ends, the United States is seeing a rise in cases of rare
insect-borne diseases such as eastern equine encephalitis, dengue
fever, West Nile virus, and the tick-borne Powassan virus. Rising
temperatures linked to climate change are extending the tick and
mosquito season into the fall, contributing to the spread of these
diseases. Experts highlight the importance of increased surveillance and
vector control to combat the diseases' spread.
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Key takeaways
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Alabama reported cases of eastern equine encephalitis, while
Connecticut saw cases of Powassan virus. The country also
recorded its first cases of locally transmitted malaria in decades.
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According to a report from the US Centers for Disease Control and
Prevention, West Nile virus remains the leading cause of viral
disease spread by insects in the continental United States. In 2021,
there were over 3,000 reported cases of arboviral diseases, with
2,911 cases being attributed to West Nile virus. Neuroinvasive West
Nile virus disease, which affects the nervous system, had the
highest incidence rate since 2012 at 0.6 cases per 100,000 people,
primarily due to an outbreak in Arizona.
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While West Nile virus was the most common cause of neuroinvasive
arboviral disease, another virus called La Crosse virus continued to
be the most common cause of neuroinvasive arboviral disease in
children. Public health experts advise using insect repellent and
wearing protective clothing to prevent mosquito bites and reduce
the risk of infection.
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By the digits
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30%: The rare disease of eastern equine encephalitis, or EEE, has
a 30% fatality rate, and many survivors have lasting neurological
issues.
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25%: About 1 in 4 people infected with dengue get sick, with
symptoms including fever, vomiting, rash and muscle
pain, according to the CDC. Most people recover within a week, but
about 1 in 20 develop severe dengue, which can become lifethreatening within just a few hours after an individual’s fever begins
to drop.
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642: The U.S. has logged 642 cases of dengue this year, according to
the CDC. That is far below last year’s total of more than 1,200, but
experts said the disease typically peaks in late summer, especially
August.
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247: West Nile virus remains the leading mosquito-borne disease
threat in the U.S. As of Aug. 22, 247 cases had been confirmed this
year, with Arizona and Colorado reporting the most, according to the
CDC.
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