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A study involving 600,000 people shows Pfizer's COVID-19 vaccine reduces symptomatic infections by 94%. This real-world study contrasts with earlier clinical trials. The CDC warns of a listeria outbreak linked to soft cheeses, advising vulnerable groups to avoid them. The specific cheese type is still unidentified. The video concludes with credits to Kaiser Health News.

What was the sample size of the study conducted on Pfizer's vaccine?

Who are the groups advised not to consume soft cheeses due to the listeria outbreak?