It's Memorial Day Weekend. What's safe to do?

This Memorial Day holiday weekend, vaccinated people will be able to do a lot safely, but those not yet vaccinated should still use caution.

With coronavirus infections dropping around the country and more than 50% of adults fully vaccinated, are most activities now safe to do? Can we get together with our extended family and friends? What if we're vaccinated but some of our loved ones are not—and does it matter if they are adults or children? Are there situations in which we still need to keep our masks on? It depends, said CNN Medical Analyst Dr. Leana Wen, an emergency physician and visiting professor of health policy and management at the George Washington University Milken Institute School of Public Health. She's also the author of the forthcoming book "Lifelines: A Doctor's Journey in the Fight for Public Health."