マイコプラズマ肺炎、止まらない流行 患者数、過去最多さらに更新：朝日新聞デジタル
In Japan, "the unusual spreading of mycoplasma pneumonia is unstoppable.. Mycoplasma pneumonia is characterized by a long latent period of 2 to 3 weeks to onset.. Its major symptoms include fever, cough, fatigue, and headache. In some cases, the cough last for several weeks."
Japan is experiencing an outbreak of influenza also.
'Mycoplasma pneumonia epidemic continues; number of patients reaches new record high'