Samples taken from a form one student in Elgeyo Marakwet have tested negative for the Ebola and Marburg viruses.
County Health Executive Kiprono Chepkok said the samples were airlifted to Kenya Medical Research Institute in Nairobi where the testing was done.
Panic had gripped Simotwo High School as the student died on Tuesday after exhibiting symptoms similar to those of Ebola.
Chepkok said: “We received a student at our sub-county hospital who was bleeding from all the orifices. He was referred to Moi Teaching and Referral Hospital but died before getting there.”
Chepkok said the sudden death triggered panic but that students, teachers and other staff were urged to patiently wait for the test results.
“We took samples from the body. We wanted to rule out Ebola and Marburg.”
He said the Tuesday quarantine at the school was lifted after Kemri released the test results on Wednesday.