Figure 6From: Growth, physicochemical properties, and morphogenesis of Chinese wild-type PRV Fa and its gene-deleted mutant strain PRV SA215PRV titers influenced by freeze-thawing treatments. The PRV virus was treated with different freeze-thawing durations and cultured at 37°C for 1 h. Titers were determined in each treatment. Averages plotted and standard deviations from three independent experiments are shown.Back to article page