experiments involving the cocultivation of four genera of beta-lactamase-positive ( beta-lac ( + ) ) bacteria and a beta-lactamase-negative ( beta-lac ( - ) ) n. gonorrhoeae on modified thayer-martin medium indicated that suppressed or inhibited beta-lac ( + ) bacteria did not give false-positive results when isolated beta-lac ( - ) colonies of gonococci were tested .
C0597979
beta-lactamase
C0004611
bacteria