1. 7 to 9 day old mice are more susceptible than older mice to injections of fixed or street virus by any route.
2. 20 day old mice are more susceptible than 60 day old mice to peripheral but not intracerebral injection of fixed virus.
3. 20 day and 60 day old mice are equally susceptible to street virus.
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Copyright, 1940, by The Rockefeller Institute for Medical Research New York
1940
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