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Handylab GBS ASR on the Jaguar Waddington J1, Hopki Contact: Minocycline Activity Tested Against Acinetobacter baumannii, Burkholderia Robert K. Flamm, PhD JMI Laboratories 345 Beaver Kreek Centre, Suite A cepacia Species Complex, Stenotrophomonas maltophila, and Select North Liberty, Iowa 52317 Enterobacteriaceae Isolates from a European Surveillance Program (2013) Email: [email protected] R.K. Flamm, M. Castanheira, J.M. Streit, R.N. Jones JMI Laboratories, North Liberty, IA, USA Introduction Results Conclusions Acinetobacter spp. may be found as causes of • Based on the definition of non-susceptible to ≥1 agent in ≥3 antimicrobial classes, 92.8% of A. baumannii • Tetracyclines differ greatly in their activity Table 1. Summary of minocycline activity tested against selected Gram-negative bacterial isolates from European and infections in critically ill patients with comorbidities and 14.6% of Enterobacteriaceae were MDR (Table 1). against Gram-negative bacteria (Tables 2-4). and in soldiers returning with combat injuries from the Mediterranean region medical centers (2013). • Colistin was the most active agent tested against all A. baumannii with a MIC90 value of 2 mg/L (94.1% Middle East. These organisms are frequently • Minocycline was the most active “tetracycline” multidrug-resistant (MDR) and there are limited susceptible; Table 2). Minocycline was the second most active agent and the most active “tetracycline” No. of organisms (cumulative %) inhibited at minocycline MIC in mg/L of: choices of antimicrobials available which would be with a MIC50 value of 4 mg/L (58.6% susceptible). Susceptibility to doxycycline was lower at 35.2% and No. of tested against A. baumannii, S. maltophila, tetracycline susceptibility was further diminished at 14.9%. Susceptibility to gentamicin/amikacin/ active against this bacterium, and thus provide a Organism Isolates ≤0.06 0.12 0.25 0.5 1 2 4 8 > 8 MIC50 MIC90 and the Enterobacteriaceae isolates collected levofloxacin was 18.0/17.3/8.2%, respectively. potential therapeutic option. Resistance in these Acinetobacter baumannii 389 21(5.4) 18 (10.0) 27 (17.0) 27 (23.9) 33 (32.4) 39 (42.4) 63 (58.6) 74 (77.6) 87 (100.0) 4 > 8 from patients throughout Europe and the organisms may occur due to intrinsic mechanisms • Among the MDR A. baumannii, colistin was the most active agent exhibiting a MIC90 value of 2 mg/L (93.6% Mediterranean region during 2013. (cephalosporinase and efflux/permeability) or to susceptible; Table 2). Minocycline was the second most active agent exhibiting 55.4% susceptibility. Poorer MDR 361 4 (1.1) 12 (4.4) 21 (10.3) 27 (17.8) 33 (26.9) 39 (37.8) 63 (55.3) 74 (75.8) 87 (100.0) 4 > 8 acquired mechanisms. The usefulness of susceptibility was noted with doxycycline (30.2%) and tetracycline (8.9%). • Minocycline, particularly the intravenous carbapenems against these organisms has XDR 313 2 (0.6) 6 (2.5) 10 (5.8) 20 (12.1) 29 (21.4) 32 (31.6) 57 (49.8) 73 (73.2) 84 (100.0) 4 > 8 formulation, has activity against several diminished with the widespread occurrence of • The majority of A. baumanni were XDR (80.5%; Table 1). Colistin was the most active agent (MIC90, 2 carbapenamase mediated resistance. Polymyxins mg/L; 92.6% susceptible) and minocycline was the second most active agent (MIC50, 8 mg/L; 49.8% Burkholderia cepacia complex 3 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 1 (33.3) 2 (100.0) -- -- 4 -- ESKAPE pathogens and merits consideration may need to be used, although there are questions susceptible) and the most active “tetracycline” (Table 2). in seriously ill patients where treatment options about appropriate dosing, resistance development Stenotrophomonas maltophilia 154 1 (0.6) 22 (14.9) 53 (49.4) 45 (78.6) 21 (92.2) 8 (97.4) 2 (98.7) 2 (100.0) -- 0.5 1 • The MIC results for minocycline for the three Burkholderia cepacia spp. complex isolates ranged from 2-4 may be limited due to the presence of MDR and toxicity. mg/L for minocycline, 4->8 mg/L for doxycycline and 4->32 mg/L for tetracycline (Table 3). Enterobacteriaceae 500 0 (0.0) 0 (0.0) 12 (2.4) 79 (18.2) 109 (40.0) 141 (68.2) 87 (85.6) 30 (91.6) 42 (100.0) 2 8 bacteria. The tetracyclines, discovered in the 1940s, were an • The most active agent against S. maltophilia, (MIC , 1 mg/L; 98.7% susceptible) was minocycline (Table 3). early class of broad-spectrum of antimicrobials with 90 MDR 73 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 8 (11.0) 8 (21.9) 20 (49.3) 16 (71.2) 21 (100.0) 8 > 8 Doxycycline was slightly less active (MIC , 4 mg/L; 94.8% susceptible) and tetracycline susceptibility was activity against Gram-positive and -negative bacteria. 90 markedly lower at only 4.5% (MIC , 32 mg/L). Second-generation semisynthetic compounds such 90 XDR 13 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 1 (7.7) 3 (30.8) 0 (30.8) 9 (100.0) > 8 > 8 as doxycycline (1967) and minocycline (1972) with • Against Enterobacteriaceae, meropenem, tigecycline and gentamicin exhibited susceptibility rates of 97.2, Escherichia coli 100 0 (0.0) 0 (0.0) 5 (5.0) 40 (45.0) 26 (71.0) 8 (79.0) 8 (87.0) 2 (89.0) 11 (100.0) 1 > 8 Acknowledgements improved oral bioavailability were developed. In 2005, 96.4 and 89.8%, respectively. A total of 85.6% (MIC90, 8 mg/L) of Enterobacteriaceae were susceptible to the intravenous formulation of minocycline was minocycline, 76.6% (MIC90, >8 mg/L) to doxycycline and 66.4% (MIC90, >32 mg/L) to tetracycline. MIC50 Klebsiella spp. 100 0 (0.0) 0 (0.0) 0 (0.0) 3 (3.0) 28 (31.0) 34 (65.0) 18 (83.0) 8 (91.0) 9 (100.0) 2 8 voluntarily withdrawn in the United States, but was values for minocycline for Escherichia coli (87.0% susceptible), Klebsiella spp. (83.0% susceptible), This study was sponsored by a research grant from reintroduced in 2009 as it is one of the few treatments Enterobacter spp. (79.0% susceptible), Serratia spp. (88.0% susceptible), and Citrobacter spp. (91.0% Enterobacter spp. 100 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 22 (22.0) 44 (66.0) 13 (79.0) 9 (88.0) 12 (100.0) 2 > 8 Rempex Pharmaceuticals Inc. with USA-FDA approval to treat Acinetobacter susceptible), ranged from 1-2 mg/L (MIC90, >8 mg/L except Citrobacter spp. [4 mg/L]) (data not shown). infections. Serratia spp. 100 0 (0.0) 0 (0.0) 0 (0.0) 1 (1.0) 12 (13.0) 37 (50.0) 38 (88.0) 8 (96.0) 4 (100.0) 2 8 • For the MDR Enterobacteriaceae, tigecycline, meropenem and colistin were the most active agents at 82.2, This study evaluated the contemporary activity of 80.8, and 72.2% susceptible, respectively (Table 4). Minocycline was the next most active agent exhibiting Citrobacter spp. 100 0 (0.0) 0 (0.0) 7 (7.0) 35 (42.0) 21 (63.0) 18 (81.0) 10 (91.0) 3 (94.0) 6 (100.0) 1 4 minocycline tested against contemporary 49.3% susceptibility with doxycycline and tetracycline susceptibility at 41.1 and 32.9%, respectively. A. baumannii and other Gram-negative (GN) bacilli collected at European centres during 2013. References Table 2. Activity of minocycline and comparator agents Table 3. Activity of minocycline and comparator agents tested Table 4. Activity of minocycline and comparator agents tested Bishburg E, Bishburg K (2009). Minocycline—an old drug against Acinetobacter baumannii. against Burkholderia cepacia complex and Stenotrophomonas against Enterobacteriaceae. for a new century: emphasis on methicillin-resistant maltophilia. Staphylococcus aureus (MRSA) and Acinetobacter CLSIa EUCASTa CLSIa EUCASTa CLSIa EUCASTa baumannii. Int J Antimicrob Agents 34: 395-401. Materials and Methods Antimicrobial agent MIC MIC %S / %I / %R %S / %I / %R Antimicrobial agent MIC50 MIC90 %S / %I / %R %S / %I / %R 50 90 Antimicrobial agent MIC50 MIC90 %S / %I / %R %S / %I / %R Chopra I, Roberts M (2001). Tetracycline antibiotics: Acinetobacter baumannii (389) Burkholderia cepacia Enterobacteriaceae (500)b a Mode of action, applications, molecular biology, and Organisms: Isolates of A. baumannii (389), Minocycline 4 >8 58.6 / 19.0 / 22.4 58.6 / 19.0 / 22.4 species complex (3) Minocycline 2 8 85.6 / 6.0 / 8.4 85.6 / 6.0 / 8.4 Stenotrophomonas maltophila (154), Burkholderia epidemiology of bacterial resistance. Microbiol Mol Biol Doxycycline >8 >8 35.2 / 1.6 / 63.2 35.2 / 1.6 / 63.2 Doxycycline 2 >8 76.6 / 8.8 / 14.6 76.6 / 8.8 / 14.6 Minocycline 4 - 100.0 / 0.0 / 0.0 100.0 / 0.0 / 0.0 Rev 65: 232-260. cepacia spp. complex (3), and Enterobacteriaceae Tetracycline 2 >32 66.4 / 7.2 / 26.4 66.4 / 7.2 / 26.4 (500) were selected from medical centres in Europe Tetracycline >32 >32 14.9 / 7.7 / 77.4 14.9 / 7.7 / 77.4 Ceftriaxone 0.12 >8 76.8 / 0.6 / 22.6 76.8 / 0.6 / 22.6 Clinical and Laboratory Standards Institute (2015). and the Mediterranean region. Countries and Piperacillin/tazobactam >64 >64 6.7 / 1.3 / 92.0 - / - / - Doxycycline 8 - 33.3 / 33.4 / 33.3 33.3 / 33.4 / 33.3 Ceftazidime 0.25 32 81.2 / 2.6 / 16.2 79.4 / 1.8 / 18.8 M100-S25. Performance standards for antimicrobial numbers of sites: Belgium (1), Bulgaria (2), Croatia Ceftazidime >32 >32 8.0 / 1.5 / 90.5 - / - / - susceptibility testing: 25th informational supplement.
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