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All the different kind of Mycobacterium species except Tuberculosis Leprae and Bovis are considered as environmental Mycobacterium, which usually can be isolated from sand, water and dusts. In addition to the role of their pathogenesis, they can stimulate the immune systems. The immune mechanisms following Mycobacterium environmental contamination can be either protect or destroy the immune system when facing the disease related to the Mycobacterium. The Golestan province has got 2 regions from the point of view of TB epidemy, it is higher in the east. The aim of this project is determine the prevalency of various types and strains of environmental Mycobacterium in the east and west of the region. The samples were collected from both regions from the wet sand, and muddes covered with grass and following their preparation they were cultured on the Lowen Stein Jenson. The total of samples were 220 from these 120 samples were from the region with epidemy of TB out of these we had 25 samples with positive culture (20.8%) and 47 type of mycobacterium were isolated, the most common forms of them were Mycobacterium Fortuitum (34%), Mycobacterium Flavesens (21.2%), Mycobacterium Chelonae (12.8%). From 100 samples taken from the region with low epidemy of TB 66 samples were with positive culture (66%) which 114 strains of Mycobacterium were diagnosed. The most common forms of these microorganisms were Mycobacterium Flavesens (20.1%), Mycobacterium Chelonae (18.4%) and Mycobacterium (16.6%). In conclusion in all the Golestan province without taking notice the TB epidemy form 220 samples 91% were positive culture (41.2%) which 161 different strains were diagnosed out of these the most common were Mycobacterium Fortuitum (21.8%), Mycobacterium Flavesens (20.5%) and Mycobacterium Chelonae (16.8%). The epidemy and variousity of environmental Mycobacterium in the region with low epidemy were much higher than the region with high epidemy and in regard to that these differences are due to the bioenvironmental factors. So therefore this can indicate that the possibility of higher contact between the immune systems and the environmental Mycobacterium. These Mycobacteriums can act as Booster of BCG vaccine which can continuously stimulate the immune systems and this can help the body’s proper responses when facing with the TB Mycobacterium.

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Mycobacterial diseases are among the oldest disease known to human beings. There are a lot of bitter memories of Mycobacterial invasion especially Tuberculosis and leprosy in human mind, even now after discovery of etiology, diagnostic tool, prevention, and treatment, still, the recalling the above diseases are frightening to human being. Although leprosy isn’t an serious disease nowadays but the TB after a long period of quietness, is going to be an serious risk factor for mankind, especially in third world countries, after cooperating with HIV. Some atypical Mycobacteria, which have weak pathogenicity now, adapt themselves to the new condition and present as a dangerous cause of disease. The researcher that have made themselves familiar with such Mycobacterial features, trying hard to discus carefully the specifities and weak points of these bacteria, to fight them back. The aim of this review article is to highlight one of Mycobacterial characteristic, which is bacteruosis slow growth rate.