Guests: Dr. John Lilly Dr. John Lilly fill in for the vacationing Nick Reed this morning. Here’s what he covered: Biology basics. How does our body responds to the vaccines, viruses and microbes? Circulatory system. How does that system works to help our bodies fight viruses? Blood cells and our immune system. How do vaccines work in our bodies? Understanding how our bodies fighting an infection. How do viruses work? Antigen and antibodies. "We have thousands of antibodies that help us fight off viruses"