The intraplantar inoculation of guinea-pigs was tried by the author with
virus fixe, as done by a number of investigators with viruses of herpes and foot-and-mouth disease. The results obtained are summarized as follows:
1. Inoculated into the planta with
virus fixe, the guinea-pig would die from the symptom and course specific to rabies and contain the virus in its brain. The
virus fixe thus can be passed through guinea-pigs by intraplantar inoculation.
2. The virus after 5 plantar passages could not be apparently distinguished from the original
virus fixe in the neurotropism. The decided opinion regarding this problem, however, must be established from the result of subsequent experiments.
3. Animals resisting the intraplantar inoculation of
virus fixe remain always resistant to similar treatments. This may be due to the development of local immunity following the first inoculation.
4. By repeated intraplantar inoculations, the guinea-pig would become immune to the subdural injection of the original
virus fixe. Out of 9 animals subjected to 3 treatments, only 1 case was found susceptible to the subsequent subdural inoculation. Such a well developed immunity of central nervous system against
virus fixe seems never to have been observed in any of the hitherto known antirabic treatments.
5. In guinea-pigs repeatedly treated, if they succumbed to the subdural inoculation of
virus fixe, the interval between dates of inoculation and death tends to be prolonged. This may also prove the limited development of antirabic immunity in the central nervous system.
6. Such immunity of central nervous system seems to disappear in a half year. The conclusion regarding its duration must be, however, positively determined by the further experiments.
7. Virulicidal principles are detected in the serum of guinea-pigs thus immunized against
virus fixe.
8. The guinea-pig is also susceptible to the intraplantar inoculation of "street virus."
9. The author failed to detect the living virus in the brain of 1 guinea-pig, which succumbed to the subdural injection of
virus fixe carried out 13 days after 3 intraplantar inoculations. It may probably be one example of "neuro-infection auto-stérilisable" (Levaditi).
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