The patient was diagnosed as having Kawasaki's disease. Streptococci were isolated from cultures of all blood samples collected during the acute stage (the third, fifth and seventh day of the disease). The streptococci were subsequently identified as Streptococcus sanguis (MCLS-1) and Streptococcus pyogenes. This finding may suggest induction of Kawasaki's disease by S. sanguis MCLS-1, and in this case, the complication of septicemia by S. pyogenes.
