Paper II
2020 February (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Define inclusion bodies and give two examples

Q72 marksShort Notes

Answer

Inclusion bodies are distinct, microscopically visible structures forming within infected cells during certain viral infections, representing accumulations of viral particles/proteins/nucleic acid or altered host cell components.

Two examples:

  1. Negri bodies — eosinophilic, round-to-oval intracytoplasmic inclusions found in neurons infected with rabies virus, classically in hippocampal pyramidal cells/cerebellar Purkinje cells; historically the classical diagnostic finding for rabies.
  2. Owl’s-eye inclusions — large, eosinophilic intranuclear inclusions with a surrounding halo, seen in cells infected with cytomegalovirus (CMV).

(Other valid examples: Cowdry type A bodies — herpes simplex/varicella-zoster virus, intranuclear; Guarnieri bodies — vaccinia/variola, intracytoplasmic.)

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