FIG. 1.

Nonspecific infection of permanent cell lines by HRSV and BRSV. (A) Human cell lines A549 and HEp2 and the bovine cell line MDBK are permissive for both HRSV and BRSV. Infection was visualized by immunostaining of RSV F. (B) Infection or mock infection (dotted lines) of human hematopoietic cell lines BJAB, HL60, and Jurkat with BRSV (filled curves) or HRSV (heavy lines). Surface expression of RSV F was determined by FACS at 4 dpi. Results from a single representative experiment are shown. FITC, fluorescein isothiocyanate; α-RSV-F, anti-RSV-F.