Impact of Streptococcus pyogenes infection in susceptibility to psoriasis: A systematic review and meta-analysis

Table 1 Characteristics of included studies

Ref.	Location	Total cases		Number of streptococcal strains		Diagnostic method	NOS score
		Case	Control	Case	Control
Baker et al[10], 1991	Iceland	78	27	42	0	Antistreptolysin-O	8
Baker et al[11], 1993	Iceland	9	18	5	4	Skin TCL	8
Villeda-Gabriel et al[12], 1998	Mexico	68	56	14	0	Immunofluorescence	6
Brown et al[13], 2000	United Kingdom	13	12	10	5	Skin TCL	7
Cancino-Díaz et al[14], 2004	Mexico	218		OR: 11.11; 4.33-28.49		Hsp60	5
Weisenseel and Prinz[15], 2005	Germany	19	9	8	0	Antistreptolysin-0	6
Zhao et al[16], 2005	China	98	42	5	1	Conventional	7
Raza et al[17], 2007	Pakistan	40	40	5	0	Conventional	8
Nahary et al[18], 2008	United Kingdom	24	10	7	3	Anti-beta-hemolytic streptococci	7

Hsp60: Heat shock protein 60; NOS: Newcastle-Ottawa scale; OR: Odds ratio; TCL: T-cell lymphoma.