. Each infected 96-well plate included nine 10-fold dilutions of each Sabin strain in triplicates,and three uninfected wells that served as negative controls. The infected cell plates were removed from the incubator at 6, 12, 18, and 24 h post-inoculation and 10 _l of 4.5% Triton X-100 was added to each well. The plates were sealed with a foil and stored at −80 ◦C prior to quantitative osRT-PCR analysis.