the new aminothiazoyl-cephalosporin , ceftriaxone ( ro 13-9904 ) , was found to have excellent inhibitory activity against the enterobacteriaceae ( minimum inhibitory concentration needed to inhibit 50 % of isolates ( mic50 ) less than or equal to 0.004-0.5 microgram/ml , haemophilus influenzae ( mic50 less than or equal to 0.004 micrograms/ml ) , neisseria species ( mic50 less than or equal to 0.001 microgram/ml ) , pneumococci ( mic50 0.25 micrograms/ml ) , staphylococcus aureus ( mic50 2.0 micrograms/ml ) , and streptococcus pyogenes ( mic50 0.015 micrograms/ml ) .
C3536856
cephalosporin
C0007561
ceftriaxone