Those who receive a Covid booster jab can expect to mount an immune response in a matter of days – not weeks, scientists say. The boosters have been shown to restore the body’s immunological ...

Most vaccines — and boosters — are injected directly into muscle tissue, usually in the upper arm, to kickstart the body's immune system in the fight against disease.

Queensland's top doctor has urged anyone over 40 to get a Covid booster because of changes to a person's immune system after that age. At Friday's Covid update, Chief Health Officer Dr John ...