places around the country, i'm sure. the image on the left, i assume, is the patient who was previously vaccinated and had a very mild case of covid for which there was very little involvement of the lungs and the picture on the right is a picture of a patient who was previously not vaccinated, didn't get around to having the vaccine and has a lot of white spaces, cloudy areas of the lungs that are indicative of in a pneumonia. >> can you explain what the vaccine does to the body's immune system to create these results? >> well, so the vaccine gives your body a head start to see -- to react to a virus -- to a foreign invader well in advance of when that infection occurs. and so it's like having an army prepared before an attack. and so in the vaccinated patient, that army is ready,