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A booster dose of the Pfizer vaccine is still needed to generate a good antibody response against the more infectious BA.2 Omicron variant, with new US data showing the vaccine produces a similar response to both the BA.1 and BA.2 variants. The research also had some good news for vaccinated people who've already caught the BA.1 version of Omicron, with the study showing they also are likely to have developed good antibody levels against BA.2 The authors say these findings have important public health implications and suggest that the increasing frequency of BA.2 is probably related to its increased transmissibility rather than it being more able to escape the immune system.
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