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Replication of the FIV isolates and the viable cell counts in PIPP-I cells after infection with the FIV isolates. (A) Production of FIV as examined by RT assay of the culture supernatants from PIPP-I cells. (B) Counts of viable PIPP-I cells. Feu-P, Tsushima cat-derived FIV isolated by cocultivation with PIPP-I cells; Feu-K, Tsushima cat-derived FIV isolated by cocultivation with Kumi-1 cells; Fukuoka, domestic cat-derived FIV isolated by cocultivation with Kumi-1 cells.
