<prompt> Nocardia is differentiated from Actinomyces by ?Gram stainZN stainNocardia causes mycetoma, Actinomyces does notNocardia is faculative anerobe  <response>: Ans. is b i.e. Z.N. Stain Differences between Actinomyces and Nocardia Actinomyces Nocardia . Anaerobic or microaeroph i I ic . Non-acid fast . Strict aerobe . Acid fast N. astroides and N. brasilensis . Natural habitat mouth, . Natural habitat -- Soil intestine, vagina . Most infections are endogenous . Most infections are exogenous . Grows at 35 - 37degC . Can grow at wide range of temperature . Causes Actinomycosis . Causes Nocardiasis . Can occur with normal host . More common with deficient CMI immunity . Tt -- Penicillin . Tt --- Sulfonamide . Nocardia is acid fast, can be differentiated from Actinomyces by Ziehl Neelsen Z.N. stain. . Both can cause actinomycetoma. . Both are gram positive so can not be differentiated by Gram stain. 