Abstract
Moraxella Catarrhalis emerged as the third cause of respiratory tract infection in children.Over 90% of the Moraxella Catarrhalis strains isolated currently produced by β-lactamases positive.Moraxella Catarrhalis resist to Ampicillin because of the β-lactamases,such as the BRO-1 type,BRO-2 type and BRO-3 type.The BRO genes appeared to be located on the chromosome and be coded.Twenty-one new mutations were found in the putative promoter region of the BRO genes. Key words: Moraxella catarrhalis; Drug resistance; β-lactamases; BRO-gene
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