Theoretically most patients with cat-scratch fever or cat-scratch disease are mildly ill. Infectious diseases are characterized by infections of different organs and patients will present differently. Most lymph node infections are not fatal, but as the infection spreads, Barr through the body infects the lining of the heart, causing endocarditis. Endocarditis is often different again from typical endocarditis, which often relies on positive blood cultures as diagnostic criteria. Cat-scratch fever or cat-scratch disease is Baltons, which is the etiology of intracellular infection. Therefore, blood cultures are negative until the heart forms a superfluous organism, so this is when treatment is often delayed or results in an incorrect diagnosis. As its involvement of the heart organs prolongs, endocarditis manifestations such as hemodynamic changes, embolic manifestations such as stroke, or circulatory instability caused by an overly intense inflammatory response syndrome can be fatal. This is a serious disease that requires a longer course, but in most cases cat-scratch fever is not fatal.