By Jocelyn Solis-MoreiraAug 18 2021 All COVID-19 vaccines appear less effective when faced with variants such as Delta, according to a new medRxiv* study. However, the researchers suggest that booster shots may help improve immunity and protect against symptomatic severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. The study authors write: “Modelling of predicted vaccine efficacy against variants over time suggests...
