title: [Studies on Echo 9 virus. II. Biological properties of the "cold" mutant].
mesh_terms: D000818:Animals; D003080:Cold Temperature; D046508:Culture Techniques; D029822:Enterovirus B, Human / Q000254:growth & development*; D000882:Haplorhini; D006801:Humans; D009154:Mutation; D014776:Virus Cultivation
vernacular_title: Badania wirusa Echo 9. II. Własciwości biologiczne "zimnego" mutanta.