The Great Meadows Regional School District closed schools in Liberty Township last week after dozens of students became sick with flu-like symptoms.
A teacher at Liberty Elementary School is being treated for H1N1.
About 60 district students were out sick on January 16, and more were sent home. About one-third of the students at Liberty Elementary School in Liberty Township were absent, according to a nurse there.
Health officials say there is no concern for neighboring districts.