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(WTTW News)

President Joe Biden says people who have been waiting for the FDA to formally approve a COVID-19 vaccine should get their shot now to stem what he calls a “pandemic of the unvaccinated.” Dr. Michael Angarone of Northwestern Medicine weighs in on that and more.

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A new Johns Hopkins study finds fewer than 20% of organ transplant patients generated an antibody response to the first dose of both the Pfizer-BioNTech and Moderna vaccines. (WTTW News via CNN)

A preliminary study from Johns Hopkins University finds that fewer than 20% of organ transplant patients generated an antibody response to their first dose of the COVID-19 vaccine. The research raises questions about vaccine protection for those patients and others with weakened immune systems.