MAHOMET - Students in the Mahomet-Seymour school district are seeing an outbreak of whooping cough.
As of Wednesday, four students had been diagnosed with the severely contagious bacterial illness.
Known also as pertussis, whooping cough is spread through person-to-person contact. Early symptoms resemble that of the common cold, but the disease is characterized by a violent, uncontrollable cough.
Superintendent Rick Johnston says the district is working with the Champaign-Urbana Public Health District to control the spread. A notification letter to parents was also sent home.
The health district strongly encourages children to be vaccinated.