Strains of Bacillus abortus freshly isolated vary in their CO2 requirements. The origin and sources of the strains growing with less dependence on CO2 (or sealing) may be in vaccinal strains or possibly in continued existence in the udder. The importance of these possibilities makes it desirable that all strains isolated should be subjected to some such test as is outlined in these pages.
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Copyright, 1926, by The Rockefeller Institute for Medical Research New York
1926
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