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17-SPT-14 Tebipenem Utis.Indd Contact Information: Rodrigo E. Mendes, PhD Antimicrobial Activity Assessment of Tebipenem (SPR859) against an Isolate JMI Laboratories ASM Microbe 2018 345 Beaver Kreek Centre, Suite A To obtain a PDF of this poster: Collection Causing Urinary Tract Infections North Liberty, IA 52317 • Scan the QR code 1 1 1 2 2 1 Phone: (319) 665-3370 OR Sunday-560 RE MENDES, PR RHOMBERG, A WATTERS , N COTRONEO, A RUBIO, RK FLAMM • Visit https://www.jmilabs.com/data/posters/ASM Fax: (319) 665-3371 -Microbe-2018-tebipenem-UTIs.pdf 1 2 Charges may apply. JMI Laboratories, North Liberty, Iowa, USA; Spero Therapeutics, Cambridge, Massachusetts, USA Email: [email protected] No personal information is stored. Antimicrobial susceptibility testing Table 2 Antimicrobial activity of carbapenem agents tested against all Enterobacteriaceae clinical isolates included in the study • Tebipenem (MIC50/90, ≤0.015/0.03 µg/mL) and ertapenem (MIC50/90, ≤0.015/0.03 µg/mL; Organism group (no. of isolates) No. of isolates and cumulative % inhibited at MIC (µg/mL) of: • Isolates were tested for susceptibility by broth microdilution following guidelines in MIC MIC 100.0% susceptible) showed equivalent MIC values against E. coli isolates; MIC90 Introduction Antimicrobial agent ≤0.015 0.03 0.06 0.12 0.25 0.5 1 2 4 8 16 32 >32 50 90 values were 8-fold lower than imipenem (MIC , 0.12/0.25 µg/mL; Table 3) the CLSI M07 (2018) document Enterobacteriaceae (412) 50/90 91 185 73 42 9 1 1 1 1 1 0 1 6 Tebipenem 0.03 0.12 • A total of 20.8%–38.6% of E. coli isolates were resistant to parenteral cephalosporins • Urinary tract infections (UTIs) are among the most frequent infectious diseases • Testing used reference 96-well panels manufactured by JMI Laboratories 22.1 67.0 84.7 94.9 97.1 97.3 97.6 97.8 98.1 98.3 98.3 98.5 100.0 affecting humans and represent an important public health problem with a 1 34 208 58 30 58 12 3 3 0 2 3 (cefazolin and ceftriaxone), levofloxacin, and trimethoprim-sulfamethoxazole (Table 3) • Quality assurance was performed by concurrently testing CLSI-recommended Imipenem 0.12 1 substantial economic burden 0.2 8.5 59.0 73.1 80.3 94.4 97.3 98.1 98.8 98.8 99.3 100.0 • The oral agents amoxicillin-clavulanate and fosfomycin, showed susceptibility rates quality control reference strains (E. coli ATCC 25922 and 35218; Pseudomonas 339 19 16 12 6 3 3 2 1 1 1 2 7 Ertapenem ≤0.015 0.06 • UTIs are primarily caused by gram-negative bacteria, and Escherichia coli remains aeruginosa ATCC 27853) 82.3 86.9 90.8 93.7 95.1 95.9 96.6 97.1 97.3 97.6 97.8 98.3 100.0 of 87.1% and 99.0%, respectively (CLSI criteria) against E. coli (Table 3) the main pathogen responsible for uncomplicated cystitis and pyelonephritis, ESBL and pAmpC (38) • Tebipenem (MIC , 0.03/0.06 µg/mL) had MIC results 4- to 8-fold lower • Breakpoint criteria for comparator agents were from the M100 CLSI (2018) and 5 20 5 3 2 0 0 1 1 1 50/90 followed by other species, such as Klebsiella pneumoniae and Proteus mirabilis Tebipenem 0.03 0.25 EUCAST (2018) documents 13.2 65.8 78.9 86.8 92.1 92.1 92.1 94.7 97.4 100.0 than imipenem (MIC50/90, 0.12/0.5 µg/mL; 95.2%–95.7% susceptible) against 2 25 5 2 3 0 0 1 Imipenem 0.12 1 K. pneumoniae (Table 3) • These isolates commonly responsible for nosocomial UTIs have become resistant 5.3 71.1 84.2 89.5 97.4 97.4 97.4 100.0 to several antimicrobial agents in hospitals around the world since the late 1980s 6 7 7 6 5 2 1 0 1 0 0 1 2 Ertapenem 0.06 4 − While ertapenem (91.8% susceptible) demonstrated in vitro activity against 15.8 34.2 52.6 68.4 81.6 86.8 89.5 89.5 92.1 92.1 92.1 94.7 100.0 K. pneumoniae, other agents tested had marginal coverage (47.6%–88.9% − A group of β-lactamases distinct from the historically common TEM and SHV KPC or OXA-48 (8) enzymes, specifically CTX-M-15, emerged during the mid-2000s Results 1 0 0 0 0 1 6 susceptible) when applying the CLSI criteria (Table 3) Tebipenem >32 12.5 12.5 12.5 12.5 12.5 25.0 100.0 − The nosocomial emergence and dissemination of such resistant isolates was 1 2 0 2 3 • Ertapenem (MIC50/90, ≤0.015/≤0.015 µg/mL; 100.0% susceptible) showed the • Tebipenem showed MIC50 and MIC90 values of 0.03 and 0.12 µg/mL, respectively, Imipenem 32 followed by their emergence in the community 12.5 37.5 37.5 62.5 100.0 lowest MIC50 and MIC90 results against P. mirabilis, followed by tebipenem when tested against all Enterobacteriaceae isolates or the wild-type subset (Tables 1 1 1 5 Ertapenem >32 (MIC , 0.06/0.12 µg/mL) (Table 3) • The spread of a specific clone defined as belonging to phylogenetic group B2, 2 and 3) 12.5 25.0 37.5 100.0 50/90 serotype O25:H4, and multilocus sequence typing (MLST) 131, has been identified Wild type (366) • Piperacillin-tazobactam (100.0% susceptible), amoxicillin-clavulanate (93.2%– − Similar tebipenem MIC values were obtained against isolates with confirmed 86 165 68 39 7 1 as an important contributor to the epidemic of antimicrobial resistance in E. coli Tebipenem 0.03 0.12 98.1% susceptible), and ceftriaxone (90.3% susceptible) were active against ESBL and/or pAmpC enzyme production (MIC50/90, 0.03/0.25 µg/mL) (Table 2) 23.5 68.6 87.2 97.8 99.7 100.0 in the hospital and community settings, especially for first-line agents such as 1 32 183 53 28 55 12 2 P. mirabilis (Table 3) Imipenem 0.12 1 fluoroquinolones and extended-spectrum cephalosporins • Tebipenem (MIC50/90, 0.03/0.12 µg/mL) and ertapenem (MIC50/90, ≤0.015/ 0.3 9.0 59.0 73.5 81.1 96.2 99.5 100.0 333 12 9 6 1 1 2 2 0.06 µg/mL) showed similar MIC results when tested against all Ertapenem ≤0.015 ≤0.015 • This epidemiologic shift has great implications for the empiric management Enterobacteriaceae isolates included in the study (Table 2) 91.0 94.3 96.7 98.4 98.6 98.9 99.5 100.0 of community-acquired UTIs; therefore, oral agents to treat outpatients with high risk for extended-spectrum β-lactamase (ESBL) infections or to be used − Tebipenem MIC values obtained against all Enterobacteriaceae isolates were Table 3 Activity of tebipenem and comparator antimicrobial agents when tested against Enterobacteriaceae uropathogens Conclusions 4- to 8-fold lower than imipenem (MIC , 0.12/1 µg/mL) Organism group (no. of isolates) CLSIa EUCASTa as a stepdown therapy would become valuable assets in the antimicrobial 50/90 MIC MIC Range Antimicrobial agent 50 90 %S %I %R %S %I %R • Overall, tebipenem was highly potent against a current collection of armamentarium • When tested against isolates with confirmed ESBL and/or pAmpC enzyme Enterobacteriaceae (412) Enterobacteriaceae causing UTIs in patients seen/hospitalized in US and production, tebipenem (MIC , 0.03/0.25 µg/mL) displayed MIC values 4-fold Tebipenem 0.03 0.12 ≤0.015 — >32 • Tebipenem is a broad-spectrum agent introduced in Japan in 2009 for the 50/90 90 European medical centers lower than imipenem (MIC , 0.12/1 µg/mL) and 16-fold lower than ertapenem Imipenem 0.12 1 0.03 — >32 94.4 2.9 2.7 97.3 1.5 1.2 treatment of pediatric pneumonia, otitis media, and sinusitis. Tebipenem is 50/90 Ertapenem ≤0.015 0.06 ≤0.015 — >32 95.9 0.7 3.4 95.9 0.7 3.4 b • ESBL and/or pAmpC enzyme production did not adversely affect tebipenem in under development by Spero Therapeutics as the first oral carbapenem as an (MIC50/90, 0.06/4 µg/mL) (Table 2) Amoxicillin-clavulanate 2 16 ≤1 — >256 84.2 8.0 7.8 84.2 15.8 c alternative drug to combat bacteria that had developed resistance to usually used 96.4 3.6 vitro activity against E. coli, K. pneumoniae, or P. mirabilis uropathogens • All penem and carbapenem agents were less active (MIC50, ≥32 µg/mL) when Piperacillin-tazobactam 2 16 ≤0.5 — >64 93.7 2.2 4.1 88.8 4.9 6.3 antimicrobial agents tested against isolates with confirmed carbapenemase enzyme production Cefazolin 4 >16 1 — >16 29.9 22.8 47.3d • These in vitro results obtained for tebipenem warrant further clinical 77.2 22.8e development as an oral option for treating complicated/uncomplicated UTIs • This study evaluated the antimicrobial activity of carbapenem compounds tested (K. pneumoniae carbapenemase [KPC] or OXA-48) (Table 2) Ceftriaxone ≤0.25 >64 ≤0.25 — >64 80.3 0.2 19.4 80.3 0.2 19.4 against contemporary Enterobacteriaceae responsible for UTI Levofloxacin 0.06 >4 ≤0.03 — >4 80.1 2.2 17.7 73.8 5.1 21.1 Trimethoprim-sulfamethoxazole ≤0.25 >8 ≤0.25 — >8 68.9 31.1 68.9 0.7 30.3 Table 1 Genes encoding β-lactamases detected among uropathogen isolates E.
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