Letter to the Editor of Journal of Infection entitled, 'Herd immunity – estimating the level required to halt the COVID-19 epidemics in affected countries' concludes that, 'anything between 0.25–3.0% of a country’s population, the estimated number of people who could potentially die from COVID-19, whilst the population reaches the P(crit) herd immunity level, which may be difficult to accept'
https://www.journalofinfection.com/article/S0163-4453(20)30154-7/pdf