Abstract:
:Synergy, determined by isobolograms constructed from the minimal inhibitory concentrations of combinations of ampicillin and chloramphenicol, was observed against six of 13 ampicillin-susceptible Haemophilus influenzae type b isolates and against five of eight ampicillin-resistant strains by using a small inoculum of 10(4) colony forming units (CFU) per milliliter. Synergy occurred against nine of 13 ampicillin-susceptible and against two of eight ampicillin-resistant strains using a large inoculum of 10(7) CFU/ml. When synergy was not observed, additive effects occurred against the remainder of isolates. Additive effects were also observed against single strains of chloramphenicol-resistant, nontypeable H. influenzae and H. parainfluenzae. No antagonism was observed. These data indicate that ampicillin and chloramphenicol may be synergistic against a significant number of H. influenzae strains depending on inoculum size, but the effect is unpredictable for a given isolate. These data support the recommendation that ampicillin and chloramphenicol both be used as initial therapy for patients with suspected bacterial meningitis.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Feldman WEdoi
10.1542/peds.61.3.406subject
Has Abstractpub_date
1978-03-01 00:00:00pages
406-9issue
3eissn
0031-4005issn
1098-4275journal_volume
61pub_type
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