Browsing by Subject "435/822"
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(United States. Patent and Trademark Office; Texas A&M University. Libraries, 1965-07-27)
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(United States. Patent and Trademark Office; Texas A&M University. Libraries, 1998-02-17)The present invention is an improved vaccine against Brucella abortus which permits differentiation between vaccinated and field strain infected cattle. The vaccine can be administered in two different forms: (1) cell ...