1. The use of minimal heat, formalin, chloramine-T, merthiolate, or phenol as killing agents does not alter significantly the over-all capacity of Listerella monocytogenes to elicit the production of antibodies.

  2. Flagellar factors B and D are not affected by any of the agents tested.

  3. Flagellar factor A is not affected by minimal heat or formalin but is degraded by chloramine-T, merthiolate, and phenol.

  4. Flagellar factor C may be influenced by merthiolate.

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