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CrFK, GFox, and 104-C1 cell infection assay using FIV-34TF10 and OrfArep strains. Virus growth in cells was evaluated by a reverse transcriptase activity assay over time. (A) Both 34TF10 and OrfArep strains can productively infect CrFK cells, and the RT activity level is significantly above that of the cell-only control at 14 days postinfection. (B and C) 104-C1 and GFox cells can be productively infected with the OrfArep strain but not with the 34TF10 strain.
