YouTube: Golden Arm: Australian James Harrison's rare blood saves more than 2 million babies: An Australia man with a a rare blood type has given blood for more than 5 decades. https://youtu.be/ssIF9jXZBhI
YouTube: The Immune System Explained I – Bacteria Infection https://youtu.be/zQGOcOUBi6s
YouTube: Kids Health: How Your Immune System Works https://youtu.be/24IYt5Z3eC4