Fig. 7
Observed survival time of piglets. a Protection induced by vaccination of piglets with the live avirulent S.suis serotype 2 strain 05HAS68. (a) and (b) The piglets were challenged intravenously with stain 05ZYH33 and 98HAH12 as positive control.; groups (c) and (d) on day 7 after vaccination with 109 colony forming unit (CFU) of avirilent 05HAS68, the piglets were injected with the same bacterial concentrations of 05ZYH33 or 98HAH12, separately; (e) The piglets were injected only with stain 05HAS68 as negative control. b Observed protection by transfer of active specific T cell against S.suis to thepiglets (4 piglets/group). (a) The piglets were challenged intravenously with stain 05ZYH33 as positive control; (b) the piglets were transfused intravenously active specific T cell (1.8 × 109 cells) from the piglets were vaccined with stain 05HAS68 or (c) active specific T cell (1.8 × 109 cells) and plasma (5 ml) mixture from the piglets were vaccined with stain 05HAS68; (d) the piglets were transfused intravenously T cells (1.8 × 109 cells) and plasma (5 ml) mixture from healthy naïve piglets as negative controls. Each data point represents one piglet