<prompt> Valve usually not involved in rheumatic feverMitralAoicPulmonaryTricuspid  <response>: The mitral valve alone is involved in 70 of cases, with combined mitral and aoic disease in another 25; the tricuspid valve usually is less frequently and less severely involved; and the pulmonic valve almost always escapes injury. Robbins basic pathology,9th edition,pg no.391 