PASSAGING IN CHICK EMBRYOS OF NEWCASTLE DISEASE VIRUS FROM PERSISTENTLY INFECTED HELA CELL CULTURES.
D000818:Animals; D002642:Chick Embryo; D005455:Fluorescent Antibody Technique; D005615:Freezing; D006367:HeLa Cells; D006801:Humans; D009522:Newcastle disease virus; D012106:Research; D013696:Temperature; D046509:Tissue Culture Techniques; D014466:Ultraviolet Rays; D014762:Viral Interference; D014776:Virus Cultivation
CHICK EMBRYO; EXPERIMENTAL LAB STUDY; FLUORESCENT ANTIBODY TECHNIC; FREEZING; HELA CELLS; NEWCASTLE DISEASE VIRUS; TEMPERATURE; TISSUE CULTURE; ULTRAVIOLET RAYS; VIRAL INTERFERENCE; VIRUS CULTIVATION