Figure 4. Relative reactivity of the three sera classes.
A, Percentages of tested GAS antigens recognized by at least 30% of sera for each patient group. B, Percentages of antigens recognized by at least 30% of the sera of each class with FI>40,000. C, Percentages of sera for each class reacting with at least 30% of the antigens and with FI>40,000. Numbers above histograms bars indicate P values calculated with the two-tailed χ2 test.