LEBANON, Tenn. -- A rare, serious and contagious illness is likely to blame for a kindergartner's death in Wilson County, according to health officials.Officials at Vanderbilt University Medical Center confirmed Southside Elementary School student Jeffrey Ian Tisdale's death Sunday. The state Health Department said it is investigating a "probable case" of meningococcal meningitis. Vanderbilt officials said lab testing results would confirm the boy's cause of death.The boy's parents said he showed symptoms, such as a fever and neck ache, Saturday.