Abstract
Summary
1. The medium in which B. abortus strain 19 was grown influenced the phagocytosis of this microorganism. Brucellae grown on tryptose agar were phagocytosed more readily than those grown on beef agar, or in tryptose or beef broth. The effects of the media were different with Brucella and E. coli. 2. Phagocytosis of formalin-killed B. abortus 19 was promoted by previous contact with filter paper or para-hydroxybenzoic acid. The latter was effective in concentrations of 1.0 to 0.01 mg per ml, and the stimulatory effect was related in linear fashion to the logarithm of the concentration of para-hydroxybenzoic acid. These effects of filter paper and para- hydroxybenzoic acid with killed microorganisms were similar to those observed with E. coli.
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