Co studie říká o účinnosti čtvrtého očkování Covid-19?
What study says about efficacy of fourth Covid-19 vaccine shot
CNN’s Ana Cabrera speaks with Dr. Abdul El-Sayed about new data from an Israeli study on the efficacy of a fourth dose of Covid-19 vaccine while Dr. Paul Offit discusses when the Omicron surge may come to an end in the US. #CNN #News
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