1) Thomas WJ, Mcreynolds JW, Mock CR, et al:Ampicillin-resistant Haemophilus influenzae meningitis. Lancet 303:313, 1974
2) Ambler RP:The structure of β-lactamases. Philos Trans R Soc Lond, Ser B289:321-331, 1980
3) Markowitz SM:Isolation of an ampicillin-resistant, non-β-lactamase-producing strain of Haemophilus influenzae. Antimicrob Agents Chemother 17:80-83, 1980
4) Ubukata K, Shibasaki Y, Yamamoto K, et al:Association of amino acid substitutions in penicillin-binding protein 3 with β-lactam resistance in β-lactamase-negative ampicillin-resistant Haemophilus influenzae. Antimicrob Agents Chemother 45:1693-1699, 2001
5) Doern GV, Brueggemann AB, Pierce G, et al:Antibiotic resistance among clinical isolates of Haemophilus influenzae in the United States in 1994 and 1995 and detection of β-lactamase-positive strains resistant to amoxicillin-clavulanate:results of a national multicenter surveillance study. Antimicrob Agents Chemother 41:292-297, 1997
6) Yokota S, Ohkoshi Y, Sato K, et al:Emergence of fluoroquinolone-resistant Haemophilus influenzae strains among elderly patients but not among children. J Clin Microbiol 46:361-365, 2008
7) Bogdanovich T, Bozdogan B, Appelbaum PC:Effect of efflux on telithromycin and macrolide susceptibility in Haemophilus influenzae. Antimicrob Agents Chemother 50:893-898, 2006