TABLE 1.

Effects of lethal and sublethal concentrations of ciprofloxacin and AVR2-V10 on Stx2 production in culture supernatants of E. coli O157:H7 strain RM5202a

Reciprocal dilutionAgglutination with:
Ciprofloxacin concn (ng/ml)No. of AVR2-V10 particles/mlControl
25621 × 1092.5 × 1086 × 107
2+++++++±±+
4+++++++±±+
8++++++±±±+
16+++++±
32+++++
64+++++
128+++++
256+++++
  • a E. coli O157:H7 strain RM5202 is stx2 positive and was grown for 6 h in TSB. Agglutination was scored as ++, +, ±, or − according to the manufacturer's instructions. The control consisted of bacteria grown in the absence of ciprofloxacin or AVR2-V10.