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Table 4 Summary of study A results—homologous vs heterologous protection to a PCV2a vaccine

From: A bivalent porcine circovirus type 2 (PCV2), PCV2a-PCV2b, vaccine offers biologically superior protection compared to monovalent PCV2 vaccines

Protection Endpoint

Treatment Group (T)

T01—PCV2a challenge control

T02—cPCV2a Vaccine

T03—PCV2b challenge control*

T04—cPCV2a Vaccine*

PCV2a challenge (homologous)

PCV2b challenge (heterologous)

Ever positive

positive #/total # (%)

Viremia

9/10 (90%)

5/10 (50%)

9/9 (100%)

7/10 (70%)

Fecal Shedding

9/10 (90%)

3/10 (30%)

9/9 (100%)

3/9 (33.3%)

Lymphoid Depletion (LD)

6/10 (60%)

0/10 (0%)

6/9 (66.7%)

4/9 (44.4%)

Histiocytic Replacement (HR)

2/10 (20%)

0/10 (0%)

6/9 (66.7%)

2/9 (22.2%)

Lymphoid Colonization (IHC)

7/10 (70%)

4/10 (40%)

7/9 (77.8%)

3/9 (33.3%)

  1. * One animal from T03 and one animal from T04 were removed for health reasons.