Spread of infection, such as a cold or sexually transmitted infection, amongst members living together.

wake up / stay up, stay awake / get up, sit up / occur, happen

pupil, educatee, student (especially in junior high schools (中学校) or high schools (高校) in Japan)

largely; mostly

a lot / a majority

to rest / to sleep / to be absent (from) / to suspend; to be dormant

indicates that something undesirable was done or happened

to close / to finish, do something completely / to put away, to put an end to / is, or was (with conjugation), done completely / happens, or happened, unexpectedly / is done with difficulty

traditional folk song of Amami / (more broadly) traditional folk song of Okinawa

To do something completely (unintentionally); cannot help doing