title: Production of an enzootic-like pneumonia in pigs with "protoplasts" of Haemophilus parainfluenzae.
mesh_terms: D000818:Animals; D046508:Culture Techniques; D003588:Cytopathogenic Effect, Viral; D005260:Female; D011014:Pneumonia / Q000209:etiology*; D011523:Protoplasts / Q000254:growth & development*; D018108:Respirovirus / Q000472:pathogenicity*; D013552:Swine; D013553:Swine Diseases / Q000209:etiology*