In the Asia-Pacific region, nearly half of Escherichia coli urinary isolates were resistant (including intermediate and resistant) to levofloxacin or ciprofloxacin and ≥30% were resistant to third-generation cephalosporins (cefotaxime, ceftriaxone, and ceftazidime) and cefepime. Overall, 33% of urinary E. coli isolates exhibited extended-spectrum β-lactamase (ESBL)-producing phenotypes. Prevalence of ESBL-producing urinary E. coli was highest in India (60%), followed by Hong Kong (48%) and Singapore (33%). All urinary isolates of E. coli were susceptible to both ertapenem and imipenem. All urinary isolates of Klebsiella pneumoniae were susceptible to imipenem and 4% of them were resistant to ertapenem. Care should be exercised when using trimethoprim-sulfamethoxazole (TMP-SMX), fluoroquinolones, and cephalosporins for the empirical treatment of UTIs, particularly cUTI among moderately to severely ill patients. Empiric antimicrobial treatment for serious cUTIs in which risk factors for resistant organisms exist should include broad-spectrum antibiotics such as carbapenems (ertapenem, imipenem, meropenem, and doripenem) and piperacillin–tazobactam. Aminoglycosides, tigecycline, and polymyxins (colistin or polymyxin B) can be used for the treatment of multidrug-resistant organisms or serious cUTIs when first-line options are deemed inappropriate or patients fail therapy. Because of considerable variability in different countries, local epidemiological data is critical in the effective management of UTIs in the Asia-Pacific region.
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