What is the optimal growth temperature for M. xenopi?

What is the optimal growth temperature for M. xenopi?

• A. 42°C
• B. 30°C
• C. 37°C
• D. 25°C

Answer: (A)

Some mycobacteria have preferred incubation temperatures, and M. xenopi is thermophilic, meaning it grows best at higher temperatures. The optimal growth temperature for M. xenopi is around 42°C, which is higher than the temperatures favored by many other pathogenic mycobacteria (like M. tuberculosis, which grows best near 37°C). Incubating at 42°C enhances colony formation for M. xenopi and helps distinguish it from species that grow poorly at this temperature. At cooler temperatures such as 30°C or 25°C, growth is slower or poor, making recovery and identification less reliable. Therefore, 42°C is the temperature that yields the best growth for M. xenopi.

Some mycobacteria have preferred incubation temperatures, and M. xenopi is thermophilic, meaning it grows best at higher temperatures. The optimal growth temperature for M. xenopi is around 42°C, which is higher than the temperatures favored by many other pathogenic mycobacteria (like M. tuberculosis, which grows best near 37°C). Incubating at 42°C enhances colony formation for M. xenopi and helps distinguish it from species that grow poorly at this temperature. At cooler temperatures such as 30°C or 25°C, growth is slower or poor, making recovery and identification less reliable. Therefore, 42°C is the temperature that yields the best growth for M. xenopi.