Kingella kingae is a fastidious Gram-negative rod that since the 1980s
has been appreciated as a cause of a variety of human infections, inc
luding bone and joint infections, bacteremia, and rarely endocarditis
[2, 6, 7, 9]. K. kingae endocarditis is rare, and only a few cases occ
ur in normal, native valves. We report a case of K. kingae endocarditi
s in a patient with hair-cartilage hypoplasia who had previously under
gone bone marrow transplantation. The combination of these rare condit
ions is discussed.