Succeeding the previous report on antivirus activity of non immunized bovine colostrum immunoglobulin, we studied the bacteriostatic activity of the immunoglobulin, lactoferrin and lactoferrin Fe by using the automated antimicrobial susceptibility testing system. We have presented the representative positive and negative reactions. Then, we have reported that the immunoglobulin was effective in 10 of a total of 20 species which we examined. In some species, the lactoferrin was slightly more effective than the immunoglobulin was. These results indicated that the immunoglobulin, lactoferrin and lactoferrin Fe were useful for the bacteriostatic reaction.
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