Affiliation:
1. JMI Laboratories, North Liberty, Iowa, USA
2. University of Iowa, Iowa City, Iowa, USA
Abstract
ABSTRACT
Omadacycline is a broad-spectrum aminomethylcycline in late-stage clinical development for the treatment of acute bacterial skin and skin structure infections and community-acquired pneumonia as an oral and an intravenous once-daily formulation. In this study, omadacycline and comparators were tested against 69,246 nonduplicate bacterial isolates collected prospectively during 2010 and 2011 from medical centers in Asia-Pacific (11,397 isolates), Europe (23,490 isolates), Latin America (8,038 isolates), and North America (26,321 isolates). Omadacycline was tested by broth microdilution following Clinical and Laboratory Standards Institute M07-A10 (2015) methods. A total of 99.9% of
Staphylococcus aureus
isolates were inhibited by ≤2 μg/ml of omadacycline (MIC
50/90
, 0.12/0.25 μg/ml), including 100.0% of methicillin-susceptible
S. aureus
isolates and 99.8% of methicillin-resistant
S. aureus
isolates. Omadacycline potencies were comparable for
Streptococcus pneumoniae
(MIC
50/90
, 0.06/0.06 μg/ml), viridans group streptococci (MIC
50/90
, 0.06/0.12 μg/ml), and beta-hemolytic streptococci (MIC
50/90
, 0.06/0.12 μg/ml) regardless of species and susceptibility to penicillin. Omadacycline was active against
Enterobacteriaceae
and was most active against
Escherichia coli
(MIC
50/90
, 0.5/2 μg/ml),
Enterobacter aerogenes
(MIC
50/90
, 2/4 μg/ml),
Klebsiella oxytoca
(MIC
50/90
, 1/4 μg/ml), and
Citrobacter
spp. (MIC
50/90
, 1/4 μg/ml). Omadacycline was active against
Haemophilus influenzae
(MIC
50/90
, 1/1 μg/ml) regardless of β-lactamase status and against
Moraxella catarrhalis
(MIC
50/90
, 0.12/0.25 μg/ml). The potent activity of omadacycline against Gram-positive and Gram-negative bacteria indicates that omadacycline merits further study in serious infections in which multidrug resistance and mixed Gram-positive and Gram-negative infections may be a concern.
Publisher
American Society for Microbiology
Subject
Infectious Diseases,Pharmacology (medical),Pharmacology