Pfizer-BioNTech's updated COVID-19 vaccine generated a stronger immune response against the majority of the currently circulating omicron variants compared to the original vaccine for people older than 55, according to new data released by the companies Friday. The companies said the data showed clinical trial participants over age 55 who received the bivalent booster targeting omicron BA.4/BA.5 had antibody levels nearly 4 times as high as those who received the original booster. The results are based on blood samples taken from adults one month after they received single doses of either the updated booster shot or the first version of the vaccine. The number of participants in th
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