s Covid-19 infections surge in England, people are increasingly reporting catching Sars-CoV-2 for a second or even third time.
New analysis has suggested that unvaccinated individuals should expect to be reinfected with Covid-19 every 16 months, on average.
We now know that natural immunity to Sars-CoV-2 begins to dwindle over time. One
Danish study suggested that the under-65s had about 80% protection for at least six months, while the over-65s had only 47% protection.
The arrival of the Delta variant has further complicated the situation.
“Certainly in the healthcare workers that we’ve been studying, there are many people who had moderately decent levels of antibodies who have been, in some cases, previously infected and double-dose vaccinated, who have gone down with symptomatic infections,” said Danny Altmann, professor of immunology at Imperial College London.
