Figure 1.

Neutralizing antibody response for repository sera (pre-outbreak) by quartiles (Q1–Q4) and mumps cases. For each trainee, the neutralizing response to genotype A (Jeryl Lynn) is on the y-axis and genotype G on the x-axis. Mumps cases are depicted by closed circles. Q1 is depicted by open circles, Q2 by open squares, and Q3/Q4 by upward/downward facing triangles. Dotted lines show the cutoffs based on the odds ratios (Table 3): 41 for Jeryl Lynn and 16 for genotype G. Of the 8 mumps cases, 7 are within these established cutoffs.