Figure 2From: SPI-1-encoded type III secretion system of Salmonella enterica is required for the suppression of porcine alveolar macrophage cytokine expressionELISA detection of IL-1β, IL-8 and TNFα in tissue culture supernatants of non-stimulated PAMs and those exposed for 24 h to S. Typhimurium, ΔSPI1 mutant and LPS (1 μg/mL). *significantly different at p < 0.05 when t-test compared with the wild-type strain.Back to article page