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Table 2 Phenotypic characteristics of M. avium subsp. avium

From: Emerging MDR-Mycobacterium avium subsp. avium in house-reared domestic birds as the first report in Egypt

Items Phenotypic characteristics of M. avium subsp. avium
Colonies on Middlebrook 7H10 agar Small, round, creamy colored, and sticky colonies
Microscopical examination using Ziehl-Neelsen staining Non-sporulated, and non-motile acid fast bacilli
Biochemical characteristics Test Niacin production test Nitrate reduction test Tween-80 hydrolysis assay Catalase test at 68 °C Arylsulfatase Test
Observation Clear liquid No color change No color change No bubble was produced Pink color produced within few seconds after adding sodium carbonate
Results -ve -ve -ve -ve +ve