Why mRNA Covid-19 vaccines like Pfizer’s jab should be part of a long-term public health strategy

• Our immunity to the virus wanes over time and the advantage of mRNA vaccines like Pfizer’s is they’re much easier to update than the ‘viral vector’ shots like AstraZeneca’s
• We should still use the AstraZeneca vaccine now for over-50s – as any immunity is better than none and it will protect you from severe Covid-19, Nathan Bartlett says