Here's what we know about the effectiveness of vaccines for variants of concerns, notably the delta variant, first identified in India and now responsible for more than 20% of new U.S. cases.
While natural infection does seem to provide some immunity, studies suggest that it is short term. Vaccination, on the other hand, provides more robust immunity.
Answers to your COVID-19 questions about how to handle Halloween trick-or-treaters, whether it's safe to eat in a restaurant's outdoor bubble and whether you can be infected through your ear canal.