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

Study of triple vaccinated people also says Omicron infection does little to reduce chance of catching variant again

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.