8.3.6 Herd Immunity
18.104.22.168 Impact of non-pharmaceutical interventions (NPIs) to reduce COVID19 mortality and healthcare demand
22.214.171.124 COVID-19: What is herd immunity?
126.96.36.199.6.3 What is Herd Immunity? UK’s Strategy for Coronavirus
188.8.131.52 Boris Johnson: containment of Covid-19 ‘unlikely to work on its own’
184.108.40.206 Experts Hope Herd Immunity ‘Flattens’ The Coronavirus Curve