title: Detection of attenuation of recombinant influenza viruses in vitro.
mesh_terms: D005827:Genetics, Microbial; D066298:In Vitro Techniques; D009975:Orthomyxoviridae / Q000472:pathogenicity*; D011995:Recombination, Genetic; D013696:Temperature; D013997:Time Factors; D014132:Trachea / Q000382:microbiology; D014774:Virulence