"Overall, our results show that SARS-CoV-2 infection
before or after vaccination gives a significantly larger boost to the neutralizing antibody response compared with two doses of vaccine alone. The potency and breadth of the antibody response appear to improve concomitantly.
It has been well established that natural infection alone provides short-lived protection from infection (17), showing the importance of vaccination, regardless of infection history. Because vaccination protects against severe disease and death (
19), it is safer for individuals to be vaccinated before rather than after natural infection."
"Vaccination is highly effective at preventing the most severe outcomes from COVID-19 and should be provided regardless of previous infection status and age. A single dose of vaccine may provide sufficient protection for many individuals with previous SARS-CoV-2 infection. "