Pfizer says vaccine 'effective' against Omicron if given as booster

Pfizer vaccines in an ambulance converted to a vaccine hub in Cape Town, South Africa. Source: AFP

As Pfizer announces its COVID-19 vaccine is effective against Omicron, the number of hospitalisations in South Africa has increased, alarming health officials. This comes as the United Kingdom reintroduces restrictions to curb the spread of the new variant.