J&J vaccine, with time, offers stronger protection against severe illness, hospitalisation and death

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A Johnson & Johnson logo is seen in front of a medical syringe and a vial with coronavirus vaccine.
A Johnson & Johnson logo is seen in front of a medical syringe and a vial with coronavirus vaccine.
SOPA Images/Getty

The rollout of the single-dose Johnson & Johnson Covid-19 vaccine is underway across South Africa.

With various levels of efficacy (how well a vaccine works in a clinical trial) reported from these studies in South Africa, the US and Brazil, it has caused some confusion as to how well the vaccine really worked.

So what do these numbers really mean?

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