A group of mycobacteria which differ in their growth characteristics from Mycobacterium tuberculosis but which they resemble in being acid-fas t. The atypical mycobacteria are also known as the PotentiallyPathogenic Environmental Mycobacteria (P.P.E.M.). They can cause a spectrum of human disease which in some cases can resemble tuberculosis. Mostly they cause disease in immunologically compromi sed humans such as those suffering from AIDS.... atypical mycobacteria
(dysplastic naevus syndrome) a condition in which patients have numerous moles, some of which are relatively large and irregular in shape or pigmentation. There may be a family history of this syndrome or of malignant *melanoma.... atypical mole syndrome
any one of a group of community-acquired *pneumonias that do not respond to penicillin but do respond to such antibiotics as tetracycline and erythromycin. They include infection with Mycoplasma pneumoniae, Chlamydia psittaci (see psittacosis), and Coxiella burnetii (see Q fever).... atypical pneumonia
Health Encyclopedia