title: The influence of negative staining on the infectivity of vaccinia virus.
mesh_terms: D006863:Hydrogen-Ion Concentration; D010772:Phosphotungstic Acid / Q000494:pharmacology; D013194:Staining and Labeling; D014616:Vaccinia virus / Q000472:pathogenicity* / Q000648:ultrastructure
chemical_list: D010772:Phosphotungstic Acid