The virus of psittacosis inoculated intratracheally or intranasally in monkeys produces a pneumonia similar to that caused by the same active agent in man.

Intracerebral inoculation of the virus induces a meningo-encephalitis characterized principally by a mononuclear reaction in the meninges.

Indirect evidence has been adduced to show that the portal of entry of the virus in man is the upper respiratory tract.

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