when the rabbit antiserum was placed in the reference gel and patient sera were placed in the intermediate gel , antibodies to one or more antigens were detected in 61 of 71 north carolina sera , all of 7 oklahoma sera , and 9 of 10 montana sera obtained from 1 day to 40 years after onset of rocky mountain spotted fever .
C0020960
antiserum
C0003241
antibodies