Covid vaccines are safe, effective and continue to be our best protection. Breakthrough infections are expected. We’ve learned a lot about who’s at risk for severe breakthrough, including from good CDC data. With this information we can protect people better. 1/thread
Studies show lower vaccine effectiveness against severe Covid among older adults, people with immunocompromising conditions, and people with certain comorbidities—groups already at higher risk of hospitalization and death from Covid. 2/
Age matters a lot when it comes to Covid. Although unvaccinated people of all ages are far likelier to die from Covid, according to CDC’s data tracker, there’s a hugely elevated risk for older vaccinated adults, especially those over 80. bit.ly/3EFYhrX 3/ 
People with weak immune systems (such as those with organ transplants, cancer undergoing chemotherapy, and those being treated with immunosuppressive drugs) are also at higher risk of severe breakthrough infections. bit.ly/3lQNqE6 4/
Among 45 patients with vaccine-breakthrough Covid hospitalizations in a meticulous and well-analyzed study led by @CDCgov, 44 (97.8%) were age 50 or older and 20 (44.4%) had immunosuppression. bit.ly/3lRJIdf 5/
We need to shield those most at risk. This is why an additional dose and booster are necessary for people with weak immune systems, and why we must make it a priority to reach everyone over 65 with boosters. The more of us are vaccinated and boosted, the safer we all are. 6/
Vaccines are our most important tool to control Covid, but they can't be our only tool. Everyone should mask up indoors to protect the vulnerable, including with N95/KN95 masks for people at high risk, and be especially careful in places where transmission is high. 7/
I share more details about how we can thrive despite Covid. The virus that causes Covid adapts, and we must adapt also. As we learn more about Omicron, we have to adjust based on timely, accurate data. cnn.it/3oEi1qb 8/end
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