Mackie, D P The opsonic activity of whey and sera from heifers experimentally infected with Streptococcus agalactiae. [electronic resource] - The British veterinary journal - 349-54 p. digital Publication Type: Journal Article ISSN: 0007-1935 Standard No.: 10.1016/0007-1935(85)90083-1 doi Subjects--Topical Terms: AnimalsBlood Bactericidal ActivityCattleCattle Diseases--immunologyFemaleLactoseNeutrophils--immunologyOpsonin Proteins--immunologyStreptococcal Infections--immunologyStreptococcus agalactiae--immunology