This app will be helpful to know when you or your family should go to the clinic or school, when you or your family is in doubt of flu or something like that. Flu testing is not enough performed within 12 hours of fever. And, even if the fever declines, the infection continues for while. So, the timing is important for patients of flu. This app can record the body temperature and draw the chart, so you can know the timing to go to the clinic or school. (1) When to go to the clinic Flu testing is recommended to be done after 12 hours from onset. If it is too early, it may not respond to flu. On the other hand, it is said that anti-flu medication should be taken within 48 hours after fever has started. Therefore, patients should go to the clinic from 12 to 48 hours after onset. (2) When to go to the school According to the Ministry of Health, Labor and Welfare in Japan, when flu occurs, the students should not go to school until five days passed after the onset and two days passed after the fever declined.