the vaccinated student is therefore likely to get exposed. could certainly then develop a breakthrough infection. the reassuring thing is vaccines work. the student is unlikely to get anything more than symptoms like a cold but it's an unnecessary thing. i would hope that maybe something could be done to encourage the unvaccinated student to take responsibility both for him or herself but also for the roommate. it's all about taking care of each other, not just each one of us all alone. >> so kate from new york has this question. has the delta variant increased the risk for young children? my daughter is 2 years old, doesn't wear a mask, should we avoid taking her indoors in public? >> it's clear that this variant is capable of causing serious injury in children. you heard those stories coming out of louisiana pediatric icus