Feces E coli lactose positive not usually identified lactose positive sp. common, healthy intestine shigella salmonella, yersinia lactose negative identified
• E. coli – lactose positive – not usually identified – lactose positive sp. common, healthy intestine • Shigella, Salmonella,Yersinia – lactose negative – identified Feces
Enterobacteriaceae other sites identified biochemically
• other sites – identified biochemically Enterobacteriaceae
Serotypes o reference laboratory antigens o(lipopolysaccharide ●H( gellar K(capsular)
Serotypes ⚫ reference laboratory – antigens ⚫ O (lipopolysaccharide) ⚫ H (flagellar) ⚫ K (capsular)
Escherichia coli
Escherichia coli
Escherichia colh o Toxins: two types of enterotoxin; Shiga-type toxin; Enteroaggregative ST-like toxin Hemolysins; Endotoxin o Type Ill secretion system o Adhesions -colonization factors both pili or fimbriae non-fimbrial factors involved in attachment. There are at least 21 different types of adhesions Virulence factors that protect the bacteria from host defenses: Capsule/ron capturing ability (enterochelin) o Outer membrane proteins
Escherichia coli ⚫ Toxins: two types of enterotoxin; Shiga-type toxin; Enteroaggregative ST-like toxin; Hemolysins; Endotoxin ⚫ Type III secretion system ⚫ Adhesions –colonization factors ; both pili or fimbriae ;non-fimbrial factors involved in attachment. There are at least 21 different types of adhesions. ⚫ Virulence factors that protect the bacteria from host defenses: Capsule/Iron capturing ability (enterochelin) ⚫ Outer membrane proteins