Resistance
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The Mycobacteria are resistance to physical influences and will retain their viability in soil and particles of dried faeces for many months.
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They are not specifically heat resistant; being killed at 60ÂșC in 15-20 mts .
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Cultures may be killed by exposure to direct sunlight for two hours.
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Bacilli in sputum may remain alive for 20-30 hrs and in droplet nuclei for 8-10 days .
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They are relatively resistant to disinfectants i.e. exposure to 5% phenol, 15% H2SO4, 3% nitric acid, 5% oxalic acid and 4% NaOH.
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It is destroyed by tincture of iodine in 5mts and by 80% ethanol in 2-10 mts.
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Last modified: Monday, 4 June 2012, 5:00 AM