The document discusses the allies of the immune system that help protect the body. It lists skin, bacteria, cilia, white blood cells, lymph nodes, vaccines, and vitamins as allies that work with the immune system. The skin acts as a physical barrier. Bacteria on the skin help prevent harmful bacteria from growing. Cilia and mucus in places like the nose work to remove bacteria and viruses. White blood cells directly attack pathogens. Lymph nodes filter the lymphatic system. Vaccines stimulate immunity without causing disease. Vitamins support overall immune function.