CAMAS, Wash. -- Nine students at J.D. Zellerbach Elementary School in Camas have become ill and health officials want to know why.

School officials told KGW Newschannel 8 that all nine kids were in the same kindergarten class. But no one seemed to know why or how the kids got sick. The students experienced some achiness and fevers as high as 104 degrees.

One mom said she had never seen her son so sick.

"We were out on the boat and he had no energy, no interest in eating or drinking. We thought maybe he was exhausted from this weekend," said concerned parent Amanda Hicks.

Her son became ill over the weekend and she kept him at home. The boy's pediatrician could not pinpoint the cause. But he did rule out the Norovirus, because the boy did not have diarrhea or vomit.

The Clark County Health Department was called in to investigate. They stopped short of calling this an outbreak.

"Whenever you get a bunch of people in small quarters for long periods of time there's more of a risk that you'll spread infection. There's one unconfirmed report of a child that is hospitalized," said Marni Storey with Clark County Public Health.

Custodians and janitors disinfected the classrooms last night in an effort to try and stop any possible spread of the illness. The county also planned to work with the school's nurse to get to the bottom of the mystery illness.

Classes were not canceled at the school.