Uninfected and infected MΦs were then incubated with fluorescently-labeled Abs to organelle markers (Table 1) or V. V was first detected intracellularly 10 min after infection with CO92 pPst- pgm- (Fig. 1, panel A) or YpIII p(IB604) (Fig. 1, panel G) in early endosomes, as indicated by the co-localization of FITC-conjugated anti-V Ab and early endosomal antigen -1 (EEA-1) Abs (Table 1) in immunofluorescence microscopy experiments (IFM). The gene discussed is EEA1; the disease is infection.