How long does COVID-19 immunity from vaccines last? Will we need booster shots? Why do some people contract COVID-19 twice? Infectious diseases physician Dr Giri Shan Rajahram from Queen Elizabeth II Hospital answers these questions and more in this 101 on COVID-19 immunity. 

Image source: Shutterstock

Produced by: Lim Sue Ann

Presented by: Lim Sue Ann

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Tags:  The Bigger Picture,  Health & Living,  COVID-19,  AstraZeneca,  vaccines,  mRNA,  immunity,  reinfection,  B-cells,  T-cells,  memory cells,  Healthcare, Pharma, Biotech,  Other personality interviews,  Health