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Growth of mFIPV in murine cells (A) and of r-wtFIPV and FIPVΔ7b in feline cells (B). Single-step growth kinetics of mFIPV and MHV in LR7 cells (A) and of r-wtFIPV, FIPVΔ7b, and FIPV in FCWF cells (B). The viral infectivity in the culture medium was determined at different times postinfection by a quantal assay on LR7 cells or FCWF cells, and the 50% tissue culture infective doses (TCID50) were calculated.
