Abstract
Serum bacteriostasis of Staphylococcus aureus was characterized quantitatively and quantitatively. Bacteriostasis was proportional to the concentration of serum. Reproducibility was good; freezing and thawing did not materially affect the end point. Four of six different strains, including the propagating S. aureus strain for phage 73 which does not produce coagulase, were susceptible to serum bacteriostasis in similar titers; two were not susceptible at all. All six strains were effective inhibitors of bacteriostasis. Active and inactive coagulase were also inhibitors. In contrast to sensitive S. aureus, S. epidermidis and Streptococcus salivarius were not uniformly susceptible to bacteriostasis by different serums. Escherichia coli, Enterobacter aerogenes, Klebsiella pneumoniae, Salmonella montevideo, S. zymogenes, and Diplococcus pneumoniae were not susceptible. Among gram-positive bacteria, only D. pneumoniae inhibited S. aureus bacteriostasis. Agglutinins of S. aureus and nonspecific substances such as lysozyme, β-lysin, C-reactive protein, and transferrin were not responsible for S. aureus serum bacteriostasis. After diethylaminoethyl column fractionation of serum, the bacteriostatic principle was eluted in proximity to blood group antibody; immunoglobulins A, G, and M appeared to be present in bacteriostatic fractions. It is suggested that S. aureus bacteriostasis by serum is due to natural antibody and that inhibitory reactions with pneumococci and coagulase are due to common antigens.
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