Psychrophiles grow best in the temperature range of 0–15 °C whereas psychrotrophs thrive between 4°C and 25 °C. Mesophiles grow best at moderate temperatures in the range of 20 °C to about 45 °C. Pathogens are usually mesophiles. Thermophiles and hyperthemophiles are adapted to life at temperatures above 50 °C. Thermophilic organisms grow optimally between 50 and 80°C. Their enzymes (thermophilic enzymes) show thermostability properties which fall between those of hyperthermophilic and mesophilic enzymes. These thermophilic enzymes are usually optimally active between 60 and 80°C. thermophiles: heat-loving organisms, optimum growth temperature is 55-65°C. Thermophiles can be found in hot springs, compost heaps, and hot water heaters. hyperthermophiles: love extreme heat, optimum growth temperature is 70-110°C. Members of this group are generally Archaea.

Thermophilic organisms grow optimally between 50 and 80°C. Their enzymes show thermostability properties which fall between those of hyperthermophilic and mesophilic enzymes. These thermophilic enzymes are usually optimally active between 60 and 80°C. These microorganisms can thrive at temperatures over 50 °C and, based on their optimal temperature, anaerobic thermophiles can be subdivided into three main groups: thermophiles with an optimal temperature between 50 °C and 64 °C and a maximum at 70 °C, extreme thermophiles with an optimal temperature 65 °C. Thermophilic microorganisms inhabit hot areas and can be classified into three categories: moderate thermophiles, extreme thermophiles, and hyperthermophiles having optimum growth temperatures of 50–60°C, 60–80°C, and 80–110°C, respectively. Thermopile organisms are able to grow at high temperature due to the chemical stability of their membrane lipids. The temperature of the human body is 37°C. Bacteria’s found the optimum temperature to grow is 37°C. The temperature allows the organism to grow and replicate. In general, the higher the temperature, the more easily microorganisms can grow up to a certain point. Very high and low temperatures both obstruct the enzyme processes microorganisms depend on to survive.

Most bacteria that cause disease grow fastest in the temperature range between 41 and 135 degrees F, which is as the Danger Zone. These microorganisms can thrive at temperatures over 50°C and, based on their optimal temperature, anaerobic thermophiles can be subdivided into three main groups: thermophiles with an optimal temperature between 50°C and 64°C and a maximum at 70°C, extreme thermophiles with an optimal temperature between 65°C. Thermophilic organisms grow optimally between 50 and 80°C. Their enzymes show thermostability properties which fall between those of hyperthermophilic and mesophilic enzymes. These thermophilic enzymes are usually optimally active between 60 and 80°C. These bacteria are all gram-negative, nonfermentative, nonsporulating rods, most of which grow better at 42 or 50 degrees C than at 35 degrees C. Some of the bacteria could be implicated as the etiological agents for meningitis, endocarditis, and septicemia. The temperature of the human body is 37°C. Bacterias found the optimum temperature to grow is 37°C. The temperature allows the organism to grow and replicate.