The city of Chicago added four states to its travel advisory for unvaccinated people on Tuesday, leaving just Michigan and parts of the East Coast without COVID-19 warnings for those who return to the city from there.

       Colorado, Maryland, Nebraska and South Dakota joined the list that now stands at 43 states and two territories where the city is recommending a 10-day quarantine or negative COVID-19 test no more than 72 hours before arrival for unvaccinated travelers. Meanwhile, Washington, D.C., was removed.

       Motorcycle enthusiasts during the 81st annual Sturgis Motorcycle Rally on Aug. 8, 2021, in Sturgis, South Dakota. (Scott Olson/Getty)

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       The states not on the travel advisory are Connecticut, Maine, Massachusetts, Michigan, New Hampshire and Vermont. States get added to the list when they report at least 15 daily cases per 100,000 residents.

       That threshold has already been surpassed in Chicago, where daily cases are averaging 454 and the positivity rate has crept up to 4.5%. Hospitalizations and deaths remain lower risk at daily averages of 21 and three, respectively.

       ayin@chicagotribune.com

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