WHO expert group recommends second Covid-19 booster for vulnerable groups

Experts appointed by the World Health Organisation (WHO) made the statement on Thursday. 

The recommendation comes in a statement issued by the Strategic Advisory Group of Experts (SAGE) on Immunisation, following a meeting held last week.  

Most Covid-19 vaccines consist of a primary series of two doses, with a first booster administered some four to six months after completion to improve immune response.