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The Guardian - UK
The Guardian - UK
World
Nicola Davis

People who caught Covid in first wave get ‘no immune boost’ from Omicron

Omicron Covid-19 Danny Altmann
person talking Covid test
The research may help explain why reinfections with Omicron over a short period of time have been so frequent. Photograph: Jakub Porzycki/NurPhoto/Rex/Shutterstock

People who caught Covid during the first wave of the pandemic get no boost to their immune response if they subsequently catch Omicron, a study of triple vaccinated people reports.

Experts say that while three doses of a Covid jab help to protect individuals against severe outcomes should they catch Omicron, previous infections can affect their immune response.

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