title: Pathogenicity of tick-borne encephalitis virus for the chicken embryo. IV. Age as a factor of non-specific resistance of chicken embryos to the lethal activity of the virus.
mesh_terms: D000375:Aging; D000818:Animals; D002642:Chick Embryo; D003168:Complement Fixation Tests; D004530:Egg Yolk; D004669:Encephalitis Viruses, Tick-Borne / Q000254:growth & development* / Q000472:pathogenicity*; D005260:Female; D006358:Hot Temperature