or
Prolex* E. Coli O157 Latex Kit 100 tests^ Prolex* E. Coli O157 Latex Kit, for the presumptive identification of Escherichia coli serogroup O157, Contains: E. Coli O157 Latex Reagent 6.2ml, Negative Control Latex Reagent 3.0ml, Positive Control 3ml, Agglutination Cards, Mixing Sticks, Size: 100tests