[jacobolus]

Probably a typo for 37.8°C, which is about the usual standard for child fever. Usually not worth calling the doctor until it’s like 39° or above, but sending a kid home with a mild fever might keep the rest of the class from catching a cold.

[w00kie]

Not a typo and it's oral or armpit temperature. Japan is weird with their concept of "fever". When I get a flu shot, they ask me to take my temperature and I have to lie every time because they won't give me the shot if I tell them I read 37.4 C