Figure 2.

The percent daily average weight change for each group of four BALB/c mice that received human immune or nonimmune sera 26 hours before subcutaneous challenge with virulent Rift Valley fever virus (RVFV) ZH501. The data shown are grouped by the resulting nAb titers measured in the mice 24 h postpassive transfer and are represented as the neutralizing antibody (nAb) titer group mean and standard error of the percent change in weight of surviving animals relative to their starting weights on the day of treatment (d –1) and then measured daily. The arrow indicates RVFV challenge on day 0.¹ Reciprocal human serum nAb titer (PRNT₈₀).