Turning sickness : infarcts in thalamus and cerebrum

Abstract

Turning sickness or cerebral theileriosis is an uncommon aberrant form of infection by Theileria parva or Theileria taurotragi in which lymphoblasts parasitized by schizonts accumulate in cerebral vessels leading to thrombosis and infarction. In the more acute form areas of intense congestion and haemorrhage are present in the meninges and brain which are associated with ares of softening (Infarction) and discoloration of brain tissue. Thrombosed meningeal vessels are often very promiment. There may be severe haemorrhage into the ventricles.