Tuberculosis (often called TB) is a contagious disease that usually attacks the lungs. Before effective treatment became available in the 1940s, TB was a dreaded disease that killed many people while sparing others. According to the Centers for Disease Control and Prevention (CDC), in the early 1900s one out of
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Pneumonia is an infection of one or both lungs caused by bacteria, viruses, or other infectious agents. The severity of pneumonia depends on several factors, including which germ is responsible and the strength of the immune system.
When the body’s immune system detects injury (from infection or other cause), it produces