LGTV infection was maintained in the ISE6 cells, and the viral titer oscillated from a low of 2610 3 ffu/ml to a high of 2610 4 ffu/ml (Fig. 1C) . After roughly one year, approximately 50% of the cells were positive for viral proteins, and the culture supernatant at this point had a viral titer of 2610 4 ffu/ml (Fig. 1C) . Thus, a persistent infection had been established in the ISE6 cells and that infection was still productive a year later.