Abstract
Summary
Comparisons of certain physical properties of canine distemper (CDV) and measles (MV) viruses have yielded data compatible with the hypothesis that they belong to the same group. Ultrafiltration of CDV indicated a particle size between 115 and 160 mμ. a value similar to that previously reported for measles. Both viruses were inactivated by ultraviolet light at a rate of 4.5 log units per erg/cm2 × 105 Irradiation with 105 roentgens of gamma particles reduced the titer 0.4 log unit at −70° and 1.0 log unit at O°C for both CDV and MV.
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