Apparent plateau in beta-lactamase production among clinical isolates of Haemophilus influenzae and Moraxella catarrhalis in the United States: results from the LIBRA Surveillance initiative.
Jones ME, Karlowsky JA, Blosser-Middleton R, Critchley IA, Thornsberry C, Sahm DF. Apparent plateau in beta-lactamase production among clinical isolates of Haemophilus influenzae and Moraxella catarrhalis in the United States: results from the LIBRA Surveillance initiative. Int J Antimicrob Agents. 2002 Feb; 19(2):119-23.