Table 1. Phenotypic characteristics of type strains Mycobacterium tuberculosis H37 (ATCC 27294), M. bovis (ATCC19210), M. africanum (ATCC25420), and the strains analyzed*.
| Strains | Colony morphology† | Test result |
|||||
|---|---|---|---|---|---|---|---|
| TCH‡ | PZA | Niacin accumulation | Nitrate reduction | Change of color of bromcresol medium | Growth on Lebek medium | ||
| Kazakhstan (n = 8)§ | Eugonic | S | R | + | – | – | Aerophilic |
| ATCC M. bovis | Dysgonic | S | R | – | – | – | Microaerophilic |
| ATCC H37 | Eugonic | R | S | + | + | + | Aerophilic |
| ATCC M. africanum | Dysgonic | S | S | + | + | – | Microaerophilic |
*TCH, thiophene-2-carboxylic acid hydrazide; PZA, pyrazinamide; +, positive test result; –, negative test result; S, susceptible; R, resistant. †Growth characteristics on Lowenstein-Jensen and bromcresol purple slants. ‡Growth in presence of TCH. §All 8 strains showed identical test results.