CAP1 and infection: In addition, while the titers for wild-type YFV-Asibi obtained in our studies are comparable to the titers others observed for wild-type DENV in C6/36 cells at three days post infection (about 5 x 106 PFU/ml), we could not detect any growth for YFV-Asibi cap0 at that time point, while DENV cap0 was only slightly impaired compared to DENV cap1 [16].