Mesophiles include most bacteria; optimum growth temperature is 20 - 45°C. Many pathogens are mesophiles as their preferred temperature is body temperature (37ºC). thermophiles: heat-loving organisms, optimum growth temperature is 55-65°C. Thermophiles can be found in hot springs, compost heaps, and hot water heaters. Thermophiles are those organisms which grow above 40 °C, and which have optimal growth temperatures between 50 and 55 °C. Above 74°C bacteria die, although spores and toxins may survive. Food that is being cooked or reheated should hit 74°C. You can hold hot food for service at 60°C.Let the abbreviation OGT means the middle of the optimal growth temperature range. The considered OGTs range from 2 to 52.5°C in plastid species, from 22.5 to 114°C in archaea, and from 7 to 85°C in bacteria. Thermophiles are microorganisms with optimal growth temperatures between 60 and 108 degrees Celsius, isolated from a number of marine and terrestrial geothermally-heated habitats including shallow terrestrial hot springs, hydrothermal vent systems, sediment from volcanic islands, and deep sea hydrothermal vents.

Generally, microorganisms with an optimal growth temperature (OGT) between 60 and 80°C are designated as thermophiles, whereas those growing optimally at temperatures of >80°C are referred to as hyperthermophiles, which are found in the three domains of life, archaea, bacteria, and eukarya, but the majority are archaea. Thermophilic bacteria are those that thrive within high temperatures, usually between 45 and 80°C and are found in environments such as hot springs, peat bogs, and near deep-sea hydrothermal vents. Thermophiles: heat-loving organisms, optimum growth temperature is 55-65°C and 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. Organisms categorized as mesophiles are adapted to moderate temperatures, with optimal growth temperatures ranging from room temperature about 20°C to about 45°C. Mesophiles are microorganisms which grow at moderate temperatures between 20 °C and 45 °C and with an optimum growth temperature in the range of 30–39 °C. They are isolated in both soil and water environments; species are found in the Bacteria, Eukarya, and Archaea kingdom. Let the abbreviation OGT means the middle of the optimal growth temperature range. The considered OGTs range from 2 to 52.5°C in plastid species, from 22.5 to 114°C in archaea, and from 7 to 85°C in bacteria. The growth rates are the highest at the optimum growth temperature for the organism. The lowest temperature at which the organism can survive and replicate is its minimum growth temperature. The highest temperature at which growth can occur is its maximum growth temperature.Their optimum growth temperature ranges between 25 °C and 40 °C. The optimum temperature for many pathogenic bacteria is 37 °C, thus the mesophiles constitute most of our common spoilage and disease microbes. Thermophiles are capable of growth at high temperatures with an optimum above 60°C. Therefore, thermophiles have been further subdivided into moderate thermophiles that grow optimally between 45 and 70°C, extreme thermophiles that grow optimally at 70°C and above, and hyperthermophiles that grow optimally at 80°C and above.