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Multicycle growth kinetics of parental and chimeric NDVs in 9-day-old chicken embryos. (A) BC backbone. (B) LaSota backbone. Embryos were inoculated with 103 PFU of virus via the allantoic route. Three embryos were chilled at every 12-h interval up to 60 h (rBC backbone) and 96 h (rLaSota backbone). Allantoic fluids were collected, and virus yields were determined by plaque assay in DF-1 cells. Error bars show standard deviations.
