Lymph Nodes:Small, bean-shaped organs that are part of the lymphatic system, filtering lymph fluid and trapping bacteria, viruses, and other harmful substances.
Lymphatic System:A network of vessels, tissues, and organs that transport lymph, a fluid containing white blood cells, throughout the body to fight infection and disease.
Plague:A severe and often fatal infectious disease caused by the bacterium Yersinia pestis, which can spread through the lymphatic system and cause the development of buboes.