Group a Total
Score
Reduced
Percentage
The Score of Gross Lesions b
Brain Serosa Joint Spleen Liver Lung
Vaccination 7 75% c 1(1/3) d 0(0/3) 3(1/3) 0(0/3) 0(0/3) 3(1/3)
Control 27   1(1/3) 7(3/3) 7(3/3) 1(1/3) 4(2/3) 7(3/3)
aVaccination: S. suis2+rSao, Control: sterile saline.
bNolesion = 0, lesion area<33% = 1, lesion area 33– 66% = 3, lesion area>66% = 5.
cDifferences between groups were analyzed by Student’s t-test P<0.05.
dThe number of piglets in a group that was confirmed to have the presence of S.
suis serotype 1 bacteria.
Table 2: Reduced percentage of pathological lesion score after challenge with heterologous Streptococcus suis serotype 1 bacteria.