Encephalitis lethargica and Encephalitis

Encephalitis lethargica noun - An encephalitis that was epidemic between 1915 and 1926; symptoms include paralysis of the extrinsic eye muscle and extreme muscular weakness.

Encephalitis and encephalitis lethargica are semantically related in type of encephalitis topic. In some cases you can use "Encephalitis" instead a noun phrase "Encephalitis lethargica".

Encephalitis noun - Inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use).

Encephalitis lethargica and encephalitis are semantically related in type of encephalitis topic. You can use "Encephalitis lethargica" instead a noun "Encephalitis".