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Drying of calf sera produced only a negligible change in their content of Acholeplasma laidlawii organisms and reduced the content of Mycoplasma arginini organisms by 2 to 4 logs. Gamma-irradiation of liquid and dried calf sera killed M. arginini and A. laidlawii organisms at irradiation levels of 0.2-0.3 and 0.4-0.6 Mrads, respectively.
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