Figure 1From: Comparative analysis of apoptotic changes in peripheral immune organs and lungs following experimental infection of piglets with highly pathogenic and classical porcine reproductive and respiratory syndrome virusTUNEL assay with tonsil tissues of piglets during infection. Shown are tonsil tissue sections from HuN4 strain-infected piglets at 3 DPI (A) and 10 DPI (B) and from CH-1a strain-infected piglets at 3 DPI (C) and 10 DPI (D), respectively. The arrows denote areas of TUNEL-positive cells. Cells undergoing apoptosis were mainly lymphocytes.Back to article page