Human commensal strains belong mostly to group A (43%; Escobar-Páramo et al., 2006; Li et al., 2010), however, in tropical areas both groups A and B1 are prevalent (Escobar-Páramo et al., 2004). Instead, strains isolated from animals fall mostly into group B1 (34–50%; Higgins et al., 2007; Ishii et al., 2007; Carlos et al., 2010), suggesting an ass...
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