What is the ideal temperature range for bacterial growth?

The ideal temperature range for bacterial growth varies among different groups of bacteria. The optimum temperature for most of the pathogenic bacteria is 37°C, which is the same as the human body. 

Based on ideal temperature for growth, bacteria may be categorized into the following groups: 

• Thermophiles: Heat-loving bacteria are called thermophiles. These bacteria can tolerate high temperatures and their ideal temperature range for growth is 55°C to 80°C.
• Mesophiles: Mesophiles include bacteria that thrive in moderate temperatures that range from 25°C to 40°C. Most pathogenic bacteria are mesophiles. 
• Psychrophiles: Psychrophiles are cold-loving microbes. They grow best at low temperatures ranges between 0°C and 20°C