Antibody response by clinical diagnosis and PCR. Median responses are shown in median fluorescence intensity minus background (MFI-BG) for antibody response to pgp3 (left) and CT694 (right) in relation to clinical diagnosis. Antibody response to pgp3 and CT694 is shown by PCR positivity to the right of each graph. Responses shown in red indicate PCR positivity. IgG responses (top panels) and IgA responses (bottom panel) are shown. For IgG, N = 208 and for IgA, N = 184.