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The median lethal dose (MLD) of a pathogenic strain of Yersinia pestis was established by three routes of administration in three strains of mouse. There was no significant difference between the MLDs in the different strains of mouse. The MLD by the subcutaneous route in Balb/C and an outbred line was approximately 1 c.f.u.; the MLD following(More)
Gruinard Island was heavily contaminated with the spores of virulent Bacillus anthracis during biological weapons trials in World War II. However, an extensive survey in 1979 showed that most of the island was not contaminated. In the early 1980s, a more intensive survey revealed that the contamination was largely confined to the top 8 cm of the soil in a(More)
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