Why are some people protected from Covid-19 without having contracted the disease?
New research suggests that exposure to other coronaviruses that cause the common cold could help develop antibodies against the SARS-CoV-2 virus
After months of uncertainty and grim headlines, some scientists are hesitantly recognizing what could be good news. During the first weeks of the Covid-19 pandemic, it was estimated that around 60% of the population would need to be exposed to the coronavirus to achieve herd immunity, which occurs when a high percentage of the community is immune to a disease.