title: The significance of the challenge strain in the potency assay of the antivaccinia immunoglobulin preparation.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral; D002642:Chick Embryo; D007106:Immune Sera; D007136:Immunoglobulins; D009500:Neutralization Tests; D012899:Smallpox / Q000276:immunology; D014616:Vaccinia virus / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D007106:Immune Sera; D007136:Immunoglobulins