前年夏天我儿出现过类似症状，前后折腾了两个多月，做了各种检查都正常，后来

发烧身上出了红疹送去急诊让住院检查，一个很好的儿科医生说是这个

Aeromonas Hydrophilla: Gastroenteritis
Occurs mostly in young children and people who have compromised immune systems or growth problems.

我不懂医，只是我儿有类似经历分享出来。