title: Problems associated with the study of spontaneous mutation towards guanidine resistance in poliovirus.
mesh_terms: D004352:Drug Resistance, Microbial; D005827:Genetics, Microbial; D006146:Guanidines / Q000494:pharmacology*; D009154:Mutation; D017955:Poliovirus / Q000187:drug effects*; D014776:Virus Cultivation
chemical_list: D006146:Guanidines