Fig. 5: Assessment of MEASs immune protection by survival curve and histopathologic examination.

a The survival curve for each group (n = 10) challenged with 5×108 CFU/mouse of ZY05719. b. The survival curve for each group (n = 10) challenged with 3 × 108 CFU/mouse of GZ0565. c, d Histopathological analysis from different groups challenged with 3 × 108 CFU/mouse of ZY05719 and GZ0565. The green arrow indicated lymphocytes infiltration; the blue arrow indicated shrinking nucleus neurons hyperchromatic; the yellow arrow indicated hydropic degeneration of hepatocytes.