THE EFFECT OF A LATENT CELO VIRUS INFECTION IN THE CHICKEN EMBRYO, ON THE PROPAGATION OF NEWCASTLE DISEASE AND INFLUENZA VIRUSES.
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Using the MBB/11/5 strain originally adapted to the PLC/PRF/5 cell line, reproduction of the virus in diploid cells of human embryo fibroblasts, continuous primate lines (RAMT, FRhK-4) and human urinary bladder tumor (T-24) lines was studied. We obtained HAV DNA sequences (about 99% from vRNA) for the MBB/11/5 strain which were used as a probe for demonstration of vRNA synthesis in the infected cells.
Continuous cells of green monkey kidney 4647 were found to be highly sensitive to three variants of the Vnukovo-32 vaccine strain of rabies virus preliminarily adapted to the primary line of Syrian hamster kidney cells. The virus litre increased with passages in the 4647 cell culture. The resulting virus variants had sufficient immunogenic potency. The time course of virus replication at a temperature of 32 degrees C was studied. The heteroploid cell line 4647 was found to be promising for manufacture of medical and veterinary cultural rabies vaccines.
Reproduction of the Mazurenko leukemia virus was studied in cell lines of different origin. Mongrel rat fibroblasts nonproductively transformed with variola vaccine virus proved to be the most adequate system for the virus replication. The leukemogenic virus reproduction in transformed rat cells was observed for 250 days.
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