howard weiner. thanks for your time.t with the delta variant because it is so prevalent in the news and unfortunately prevalent in many countries that have done so well with vaccinations. why is it coming back to haunt the u.k., israel, in the u.s. midwest? dr. weiner: the delta variant is a different type of the coronavirus. it can start up in people in a way that the others couldn't. what we are working on is not directed specifically at the type of strain, but what happens in the body and immune system after the strain is there. so there is a nasal spray we are working on, we work on the delta variant, we work on any type of strain of coronavirus. amber: i am going to caveat this question by saying i dropped out of sciences in the middle of high school, so my knowledge is significantly below what yours is. but i'm curious about how you tackle this problem in a disease that either has no effect or in -- on or cap all kinds of effects that we are just learning about. how do you decide how you're going to approach dealin