Figure 4. Relationship between MBL concentration and the capacity to support C3 deposition induced by CO antigen (1,000 ng/well) in C2-deficient sera (n = 21).

Sera were used at a final concentration of 25% with incubation at 37°C for 30 minutes. The correlation was significant (P < 0.05, r = 0.49, Spearman rank correlation).