Booster shot could substantially increase protection against Covid, finds US study

The findings of the study, which is not peer-reviewed, are 'potentially very significant', according to Ireland’s lead for the vaccination rollout Professor Brian McCraith.

Booster shots for people with waning immunity after receiving initial vaccines could serve to significantly recharge a person’s resistance to Covid-19, according to new research.

The results of a Californian study, which has not yet been independently peer-reviewed, suggest that a person whose level of immunity may have fallen from 80% to 60% eight months after receiving the Pfizer vaccine can have their level of protection increased to 87% by way of a booster shot.