24 ms·
At 3-4%? Herd immunity needs 70% in US. COVID-19 can not have spread freely if only 3% people are infected. https://www.journalofinfection.com/article/S0163-
by tshadley 6y ago
At 3-4%? Herd immunity needs 70% in US. COVID-19 can not have spread freely if only 3% people are infected.
https://www.journalofinfection.com/article/S0163-4453(20)30154-7/pdf https://www.journalofinfection.com/article/S0163-4453(20)301...