TABLE 2.
Results of checkboard neutralization assays performed with 15 primary FIV isolates and autologous and heterologous immune sera and results with the tissue culture-adapted strain FIV-Pet (for comparison)
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a
Values shown are the geometric means of the titers obtained in two or three independent assays. Dashes indicate that no neutralizing activity was detected; mean titers of <8 were not considered significant and scored as negative. The large box encloses the virus-immune serum sets obtained from cats living in the same shelter. Autologous virus-immune serum combinations are enclosed in a circle (sera obtained before or contemporaneously with virus isolation) or in a small box (sera obtained 3 to 12 months after virus isolation).