Figure 1

Serum VCA IgA titre of NPC and non-NPC. Serum samples were taken at times of diagnosis from 146 NPC patients (solid bar) and another 9093 samples were taken at different times during study from non-NPC subjects (open bar). Viral capsid antigen IgA titres of NPC patients are significantly higher than non-NPC subjects (χ2=2752.383, P<0.0001).