Infectious Disease specialists are experts in the diagnosis and treatment of illnesses caused by microorganisms. The special skills of the Infectious Disease specialist are not confined to a single organ system or cause; they include expertise in infections of any type and any cause. Along with this knowledge comes a particular insight into the use of antibiotics and their potential adverse effects. The Infectious Disease specialist also has a deep understanding of immunology (how the body fights infection), epidemiology (how infections spread), and infection control.