Abstract
Summary
Exposure of suspensions of the Borg strain of Chlamydia psittaci to graded doses of gamma radiation resulted in loss of infectivity. Exposure in the frozen state produced slower loss of infectivity than exposure in the fluid state, doses of 400,000 and 250,000 R being required, respectively, for complete loss of detectable infectivity. Both reactions deviated moderately from first-order behavior. The frozen suspensions retained greater antigenicity for mice than did the fluid suspensions and were also more antigenic than suspensions killed by treatment with formaldehyde.
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