Mortality of macrophages infected with PRRSV and
(HP). Mortality of MDM and PAMs was measured using CytoTox 96 non-radioactive Cytotoxicity assay at 4/28 h (A) and 24/48 h (B) PI with PRRSV and H. parasuis. Data are the mean ± SEM of three independent experiments. Significant differences between tested groups are denoted by different letters (a, b) (p < 0.05).