Declining immunity and new viral variants may mean annual vaccine boosters are needed
Immunologists and virologists are questioning the ability of populations to ever achieve herd immunity to Covid-19.
They say gradually waning immunity to the virus after infection or vaccination, and the impact of variants, mean it is likely annual vaccinations will be required and cases will continue to occur.
Continue reading… Source: The Guardian: Can Australia achieve herd immunity to coronavirus, and what happens if not? ———