Warsaw district officials said the Hancock County Health Department notified them of a positive test on Saturday.
They said after that, they sprang into action.
Superintendent Bob Gound said used seating and bus charts to contact trace, identify those in close contact with the patient and notify the families.
He said they were also able to get their janitorial staff into the school to thoroughly disinfect and clean the area where the patient had been.
They say while there are cases in the community, they're confident in their COVID-19 protocols.
"As long as we continue to follow those guidelines with integrity I truly believe Warsaw schools is a safe environment for our students and employees to be in," Gound said.
He said it also helped that the patient had only been in contact with small number of people and had been in a small space.
District officials said their goal is to be able to keep their students in the classroom all year without having to go remote.