THE EFFECT OF IRRADIATION WITH ULTRAVIOLET LIGHT ON VARIOUS PROPERTIES OF TYPHUS RICKETTSIAE

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Abstract
On irradiation of partially purified suspensions of epidemic typhus rickettsiae with u.-v. light, it is possible to obtain a reduction in in-fectivity for chick embryos and cotton rats of 104 and 105-fold without a marked loss in toxicity for mice, hemolytic activity, or respiration. More prolonged irradiation leads to a gradual loss of the latter properties, without a complete separation of any one. The most rapid loss is in toxicity; the least rapid, in respiratory activity.