<prompt> Moraxella catarrhalis is resistant to which antibiotic?AmoxicillinClarithromycinAzithromycinAmoxicillin and clavulanic acid combination  <response>: Ans. is a i.e., Amoxicillin Treatment of M. caterrahlis infection: M. catarrhalisrapidly acquired -lactamases during the 1970s and 1980s; antimicrobial susceptibility patterns have remained relatively stable since that time, with 90 of strains now producing -lactamase and thus resistant to amoxicillin. Most strains of M. catarrhalisare susceptible to amoxicillin and clavulanic acid combination, extended-spectrum cephalosporins, newer macrolides azithromycin, clarithromycin, trimethoprim- sulfamethoxazole, and fluoroquinolones. 