FIG. 1.
Growth of RRV at 24 h postinfection in RAW 264.7 cultures treated with 250 ng of LPS per ml. LPS and control (no LPS) cultures were RRV infected at an MOI of 0.01 after incubation for 1 h at 4°C with either normal mouse serum (RRV + NMS), serum containing polyclonal anti-RRV antibodies (RRV-ADE), or no serum (RRV alone); sera were diluted to 10−3 prior to incubation with RRV. ∗, significant (P < 0.05) decrease in RRV titer compared to RRV + NMS (as determined by unpaired Student's t test).