Light-microscopical diagnosis of rabies. A reappraisal.

The validity of reports suggesting that Lyssa and Negri bodies are non-specific in the light-microscopical diagnosis of rabies was investigated. With Seller's impression technique, a substantial proportion of speciments found to be non-rabid with the fluorescent-antibody technique showed structures indistinguishable from Lyssa or Negri bodies. Neither histological examination nor inoculation of animals with non-rabid Seller-positive material explained the nature of these rabies-like structures. The simplicity and reliability of the fluorescent-antibody technique and the occasional serious complications of prophylactic anti-rabies measures make the diagnostic use of Seller's method at best undesirable and at worst dangerous.