<prompt> Which of the following is active against atypical mycobacteria -ClarithromycinRifabutinCiprofloxacinAll of the above  <response>: Ans. is d All of the above Regimen for MAC infection o Intensive phase 2-6 months -- ClarithromycinAzithromycin ethambutol rifabutin one FQ ciprofloxacin clofazimine. o Maintenance phase 12 months -4 Clarithromycin azithromycin ethambutolone FQrifabutin. 