Abstract
Summary
1. Five isolations of a virus which causes a fatal pneumonitis of suckling mice by various routes of inoculation have been made from C3H mice known to carry the Bittner Milk Agent. 2. Older suckling mice are increasingly resistant to this virus and no apparent illness has been produced by inoculation of adult mice. 3. Specific neutralizing antisera have been produced in rabbits. 4. Due to its unique behavior and failure to show serologic or other relationships to known mouse viruses, K-virus has been regarded as an hitherto undescribed agent. 5. Long term experiments have been set up to determine, if possible, whether K-virus is identical with or related to the Bittner Milk Agent.
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