thirteen ( 24 % ) of 55 strains of bacteroides fragilis tested were resistant to 32 mug of penicillin per ml , and 6 ( 11 % ) and 3 ( 5 % ) were resistant to 100 mug of carbenicillin and ticarcillin per ml , respectively .
C0030842
penicillin
C0006976
carbenicillin