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Antimicrobial resistance in Haemophilus influenzae Tristram S; Jacobs MR; Appelbaum PCClin Microbiol Rev 2007[Apr]; 20 (2): 368-89Haemophilus influenzae is a major community-acquired pathogen causing significant morbidity and mortality worldwide. Meningitis and bacteremia due to type b strains occur in areas where the protein-conjugated type b vaccine is not in use, whereas nontypeable strains are major causes of otitis media, sinusitis, acute exacerbations of chronic bronchitis, and pneumonia. Antibiotic resistance in this organism is more diverse and widespread than is commonly appreciated. Intrinsic efflux resistance mechanisms limit the activity of the macrolides, azalides, and ketolides. beta-Lactamase production is highly prevalent worldwide and is associated with resistance to ampicillin and amoxicillin. Strains with alterations in penicillin binding proteins, particularly PBP3 (beta-lactamase negative ampicillin resistant and beta-lactamase positive amoxicillin-clavulanate resistant), are increasing in prevalence, particularly in Japan, with increasing resistance to ampicillin, amoxicillin, amoxicillin-clavulanate, and many cephalosporins, limiting the efficacy of expanded-spectrum cephalosporins against meningitis and of many oral cephalosporins against other diseases. Most strains remain susceptible to the carbapenems, which are not affected by penicillin binding protein changes, and the quinolones. The activity of many oral agents is limited by pharmacokinetics achieved with administration by this route, and the susceptibility of isolates based on pharmacokinetic and pharmacodynamic parameters is reviewed.|Anti-Bacterial Agents/*pharmacology/therapeutic use[MESH]|Drug Resistance, Bacterial/*genetics[MESH]|Haemophilus Infections/drug therapy[MESH]|Haemophilus influenzae/*drug effects/genetics[MESH]|Humans[MESH]|Microbial Sensitivity Tests[MESH]|beta-Lactam Resistance/genetics[MESH] |
