“…Furthermore, the stool of KD patients contains higher numbers of gram-positive bacteria, including Streptococcus , Staphylococcus , Eubacterium , and Peptostreptococcus genera, Hsp60-producing gram-negative bacteria, and a lower number of lactobacilli, when compared with those from healthy control children ( Yamashiro et al, 1996 ; Takeshita et al, 2002 ; Nagata et al, 2009 ). Specifically, three pathogens, S. pyogenes ( Leahy et al, 2012 ), S. mitis Nm-65 ( Tabata et al, 2021 ), and S. sanguis ( Tsurumizu et al, 1991 ), have been identified in the pleural fluid, tooth surface or blood of KD patients. Additionally, serum IgM antibodies against superantigens of S. aureus and S. pyogenes have been identified in KD patients ( Matsubara et al, 2006 ), and these two pathogens together can produce 19 different superantigens ( Llewelyn and Cohen, 2002 ).…”