FIG. 4.

Flow cytometry results obtained with two representative saliva samples for detection of sIgA against surface-exposed epitopes of M. catarrhalis O35E. Bacterial suspensions were incubated with saliva samples at a 1:20 dilution. Saliva samples were from individuals 7 (A) and 10 (B). The broken line represents the negative control (bacteria incubated with secondary antibodies only). The solid line indicates the fluorescence observed when bacteria were incubated with saliva samples.