COVID-19 moves westerly through Treasure Valley’s unvaccinated areas

Boise areas with high COVID-19 vaccination rates have remained pockets of lower spread

By: - September 9, 2021 4:35 am
Map showing new cases of COVID-19 in Ada and Canyon counties

Map showing the spread of COVID-19’s delta variant in Ada and Canyon counties, based on new cases per capita in each ZIP code. (Map by Audrey Dutton, Idaho Capital Sun)

For the past month, the delta variant has continued to spread in western Ada County and made its way into Canyon County.

An analysis of vaccination rates and new cases by ZIP code shows that areas with higher vaccination rates are doing a better job of fending off the coronavirus. But in areas with a large share of unvaccinated residents, as many as 1.4% of residents got infected between July 25 and Aug. 28.

The Idaho Department of Health and Welfare provided the Idaho Capital Sun with data on new cases of COVID-19 by ZIP code. The records were anonymized; they cannot be used to identify an individual. The Sun merged the data with vaccination rate numbers by ZIP code, which the department had provided to Idaho Public Television’s Idaho Reports.

Previously, the Sun reported a similar trend in Treasure Valley neighborhoods. Those with higher vaccination rates had fewer COVID-19 cases between late May and mid-August. The new data include the most recent full two weeks of records, during which case numbers rose quickly and hospitals became increasingly overwhelmed.

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Audrey Dutton
Audrey Dutton

Audrey Dutton, senior investigative reporter, joined the Idaho Capital Sun after 10 years at the Idaho Statesman. Her favorite topics to cover include health care, business, consumer protection issues and white collar crime. Dutton hails from Twin Falls. She attended college at Hamline University in St. Paul, Minnesota, and received a master's degree in journalism from Columbia University in New York City. Before coming home to Idaho, Dutton worked as a journalist in Minnesota, New York, Maryland and Washington, D.C. Dutton's work has earned dozens of state, regional and national awards for investigative reporting, health care and business reporting, radio journalism, data visualization and much more.