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It seems clear that generally a cool cloth is provided when a "mild or low grade fever" is present. Low-grade fever – 99 to 100.9 degrees (37.3 to 38.3 Celcius).
Fever has been defined as a body temperature elevated to at least 1°F above 98.6°F/37.0°C) or slightly < 38.0°C at approximately 37.8°C, indicates of a low grade fever.
Optimum temperature range in which most bacteria grow is 37.0 C. They grow best at human body temperature (98.6° F, 37° C) and can divide 2 to 3 times per hour. In ideal conditions (i.e. in the presence of moisture or sugar at 37°C) bacteria will grow and multiply by dividing x2 every 20minutes. After 6 hours, in ideal conditions, one bacterial cell could become 131,072 bacteria.
CAVEAT: Temperature often does not respond to infection or toxic agents.