and that question kind of ties into a question that we're getting from brittany doyle, who is the ownerf wise health, a group that is focused on addressing public health issues here in the bay area. >> there has also been discussion around co-existing diseases that are embedded in the community. will that have an impact with the vaccinations. so if somebody has chronic disease like diabetes or copd or their immune system is already compromised, will the vaccination affect their health as well? >> and i want to pose this question to you, dr. brown. what would you say? i'm sure you're getting this question a lot from your patients. >> absolutely. and it's an excellent question. i think we know that the vaccine works in people with many chronic conditions because they actually try to include people with diabetes and hypertension and asthma, because they knew these were the people at highest risk from the disease. so it's been well tested in people with many chronic conditions. we don't know about cancer patients because there may have been certain exclusions different from vaccine to vacci