Michelle Fay Cortez Niclas Rolander Bloomberg

Recovering from Covid-19 may not offer much lasting protection from future infections for those with only mild cases, according to a report that suggests caution regarding so-called herd immunity as well as the durability of vaccines.

Recovering from Covid-19 may not offer much lasting protection from future infections for those with only mild cases, according to a report that suggests caution regarding so-called herd immunity as well as the durability of vaccines.