It’s important to know how boosters work, but they must not impede the push towards worldwide vaccination
First there was Alpha, then Beta, Gamma and Delta. Now, thanks to the tremendous efforts of scientists in sub-Saharan Africa, the world is getting to grips with the Omicron variant. This new variant of Covid-19 has a number of mutations that distinguish it from previous ones, raising concerns among scientists that the vaccines we are currently using may not remain as effective against it. In response, the UK’s Joint Committee on Vaccination and Immunisation (JCVI) has recommended that all over-18s in Britain should be able to get a Covid booster shot, as long as three months have elapsed since their last vaccine.
The logic behind boosters is that ensuring the UK population has a high level of immunity will reduce the number of people requiring hospitalisation or dying as a result of the spread of Omicron. This is based on the hope that it is unlikely the vaccines we are currently using will be totally ineffective against the new variant, but it is too early to be definitive about this.
Dr Charlotte Summers is a lecturer in intensive care medicine at the University of Cambridge
