Most of the NTM have been isolated from water and soil, e.g., species of the Mycobacterium avium complex, Mycobacterium marinum, Mycobacterium kansasii, My-cobacterium xenopi, Mycobacterium simiae, and rapid growers (Table 1). Most common NTM associated with nosocomial disease are Mycobacterium fortuitum, Myco-bacterium chelonae, and Mycobacterium abscessus. M. xenopi requires a temperature of 28 °C or more to grow and has been recovered from hot water and hot water taps within hospitals.
Airborne environmental NTM may result in respiratory disease, whereas ingestion may be the source for cervical lymphadenitis and, in AIDS patients, may lead to a disseminated disease. Soft tissue and skin infections are likely a result of direct inoculation of NTM. It is not known whether NTM disease has a latent period or not.
Because NTM disease is not notifiable, the worldwide estimates of incidence and prevalence may not be accurate. A study conducted by Centers for Disease Control and Prevention (CDC, Atlanta, GA 30333, U.S.) from 1991 to 1992 demonstrated a dramatic increase in numbers of NTM, especially M. avium complex.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.