Fig. 3

Inhibitory effect of the human natural yeast killer toxin-like antibodies (KTAb) on the infectivity of rat-derived P. carinii to nude rats
The preincubation media were: KTAb-depleted vaginal secretions (1); KTAb from patient A (2); and KTAb (from patient A) neutralized by MAbKT4 (3). *p < 0.001, the parasite number compared with that of parasites preincubated in KTAb-depleted vaginal secretions.