title: The significance of the challenge strain in the potency assay of the anti-vaccinia immunoglobulin preparations.
mesh_terms: D000650:Amnion; D000818:Animals; D000914:Antibodies, Viral / Q000592:standards*; D002642:Chick Embryo; D007136:Immunoglobulins; D009500:Neutralization Tests; D013045:Species Specificity; D014612:Vaccines / Q000592:standards*; D014616:Vaccinia virus / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D007136:Immunoglobulins; D014612:Vaccines