The Acidic Fever is an immunologic reaction of the No-Maki body. When confronted with serious infectious diseases, their bodies will react by drastically shifting the pH-value of the plasmoidic fluid that serves functions of both lymph and blood for the No-Maki. While the sudden souring of the bodily plasma is dangerous to the internal organs it supplies with nutrition as well as very unpleasant for the No-Maki, it can severely hamper the spread of bacteria and viruses within the body of a No-Maki.
Acidic fever is measured by directly sampling the pH-value of the organic plasma of a No-Maki. For this purpose, a small amount of plasma is drawn with a syringe, usually by puncturing the lower abdomen, and then tested with a standard measuring instrument for pH-value. The exact value can then guide further medication and whether or not adjustment of the pH-value itself is required to prevent negative side-effects of the fever.
The presence of the fever itself can usually be senses by a No-Maki herself, as the shifting of the pH-value of their organic plasma is described as very unpleasant and distinctly recognizable.