<unk>  is divided into the three categories of acute, subacute, and chronic based on the duration of symptoms. Acute<unk>  refers to the presence of signs and symptoms of<unk>  that are present for days up to six weeks. If these signs and symptoms persist for more than six weeks but less than three months, this is subacute<unk> . Chronic<unk>  refers to the presence of such signs and symptoms when they persist for more than three months. * Subacute bacterial endocarditis (SBE) is often due to streptococci of low virulence (mainly viridans streptococci) and mild to moderate illness which progresses slowly over weeks and months (>2 weeks) and has low propensity to hematogenously seed extracardiac sites. * Acute bacterial endocarditis (ABE) is a fulminant illness over days to weeks ( 1 year following valvular surgery). * Early prosthetic valve endocarditis is usually due to intraoperative contamination or postoperative bacterial contamination which is usually nosocomial in nature. * Late prosthetic valve endocarditis is usually due to community-acquired microorganisms. Prosthetic valve endocarditis is commonly caused by Staphylococcus epidermidis as it is capable of growing as a biofilm on plastic surfaces. Cutibacterium acnes almost exclusively causes endocarditis on prosthetic heart valves.
Infective endocarditis
Libman–Sacks endocarditis
Loeffler endocarditis
Nonbacterial thrombotic endocarditis
Subacute bacterial endocarditis
Tuberculous pericarditis
Nocardiosis
Ischemic cardiomyopathy