delta variant
Breakthrough cases of COVID-19 among vaccinated people leads to ‘super immunity’December 17, 2021
COVID vaccines, previous infection likely offers ‘stronger than basic’ protection against Omicron variantDecember 13, 2021
COVID-19 vaccination AND getting sick provides strongest protection against Delta, Omicron variantsDecember 8, 2021
Delta variant appears capable of avoiding protection of Pfizer COVID vaccineDecember 3, 2021