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Slight Increase In Mosquito Disease Danger Days For Butte - KXLF.com | Continuous News | Butte, Montana

Slight Increase In Mosquito Disease Danger Days For Butte

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The number of days each year that are suitable for disease transmission by mosquitoes is rising in much of the U.S., as temperatures climb with climate change. This can increase the risk of mosquito-borne diseases such as Zika and West Nile. Following research from Stanford University, Climate Central analyzed the number of days in the spring, summer, and fall each year with an average temperature between 61°F and 93°F, which is the range for transmission of diseases spread by Aedes or Culex type mosquitoes. Of the 244 cities analyzed, 94 percent are seeing an increase in the number of these “disease danger days.”


Number of mosquito danger days in these U.S. cities

Reno leads the list of cities with additional disease danger days, averaging an additional 52 days per year in that temperature range compared to a half-century ago. The top 10 cities can be found in the report and cover a variety of climates across the U.S. For example, San Francisco, Tucson, and Erie all have more than four additional weeks each year when transmission is possible.

While dengue, Zika, and West Nile viruses are still limited in the U.S., they represent significant health threats globally and could become bigger threats as temperatures climb further in a warming climate. The land area of the U.S. most suitable for Aedes albopictus mosquitoes, which carry those diseases, is projected to increase from 5 percent to 50 percent by 2100, putting 60 percent of the Northeast population at risk.

Methodology: Temperature trends were calculated using average daily temperature data from the Applied Climate Information System. Years with more than 30 days of missing data were excluded from the analysis. The temperature range of disease transmission (61°-93°F) as well as the range for peak transmission (79°F-84°F) were chosen based on the findings in Mordecai et al. 2017.

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