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(Patty Wetli / WTTW News)

Top Chicago public health officials say that the BA.2 omicron subvariant will be making up most of Chicago cases by the end of the month.

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(WTTW News)

A growing number of states and countries are detecting the omicron variant, though it has yet to be identified in Illinois. Some say the mutation raises concerns about vaccine equity across the globe.

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Catalina Gonzalez-Marques, an emergency medical physician, receives the Pfizer-BioNTech coronavirus vaccine at Brigham and Women’s Hospital, Wednesday, Dec. 16, 2020, in Boston. (Brian Snyder / Pool via AP)

Allergies are always a question with a new medical product, but monitoring COVID-19 vaccines for any other, unexpected side effects is a bigger challenge than usual. 

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(Angelo Esslinger / Pixabay)

A handful of Chicago residents became the first in the city to participate in a national clinical trial to test a potential COVID-19 vaccine as the University of Illinois at Chicago launched its study on Monday.

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(Credit: Northwestern Medicine)

Northwestern Medicine is seeking 5,000 people who are at risk of exposure to the coronavirus and are interested in participating in vaccine studies to join its newly launched COVID Prevention Trials Registry.