<prompt> Most common form of Nocardial respiratory tract infection is ?LaryngitisPharyngitisTonsilitisPneumonia  <response>: Ans. is d i.e.,Pneumonia Nocardia are gram positive acid fast filaments. Nocardia are strict aerobes and paially urease and catalase positive. Since nocardiae are among the few aerobic microorganism that use paraffin as a carbon source, paraffin baiting can be used to isolate the organism from mixed culture. 