Last week, a study was published in the New England Journal of Medicine that suggests that people who have already been infected and recovered from Covid-19, are naturally immune to Covid and at low risk of reinfection and contracting the disease again.
In Qatar, researchers examined a cohort of more than 353,000 people using a national database. This database has information about patients with polymerase-chain-reaction-confirmed infections.
They contracted Covid-19 between Feb 2020...
