a viral infection of the central nervous system transmitted by bites of certain ticks; symptoms may include fever, malaise, anorexia, muscle aches, headache, nausea, and/or vomiting; in 20% to 30% of patients, a second phase of the disease occurs that involves the central nervous system with symptoms of meningitis, encephalitis, or meningoencephali [..]

(pathology) A viral infectious disease of the central nervous system borne by ticks, which most often manifests as meningitis, encephalitis, or meningoencephalitis.