Virus Q&A: Answers to common questions about COVID-19 vaccines, travel and more

Yes, but U.S. health officials say early data suggests they may be less sensitive at picking it up.

Government recommendations for using at-home tests haven't changed. People should continue to use them when a quick result is important.

Yes, pets and other animals can get the coronavirus that causes COVID-19, but health officials say the risk of them spreading it to people is low.

It depends. It can be safe if you're fully vaccinated against COVID-19, but officials say people who haven't gotten the shots should delay travel.

Because they might not be vaccinated with shots recognized by the U.S. Food and Drug Administration or the World Health Organization.

Yes, COVID-19 boosters use the same recipe as the original shots, despite the emergence of the more contagious delta variant. The vaccines weren't tweaked to better match delta because they're still working well.

Yes, combined with vaccination, home test kits for COVID-19 can add a layer of safety and reassurance by providing on-the-spot results during this second year of pandemic holidays.

There's no clear-cut definition for when a pandemic starts and ends, and how much of a threat a global outbreak is posing can vary by country.