Intentionally contracting COVID-19 for herd immunity is uncertain due to unknown immunity duration and effectiveness.

“we don't really know exactly what the immunity looks like in other words we don't know that once you get this corona virus if you recover from it and let's say you're one of the majority of people who recover from it and to be clear most people who get this virus recover from it at a minimum 80% do but it could be significantly higher it could be 95% we don't know if that immunity is going to last them for another six months another year another five years for the rest of their lives we don't know”