FIG. 1.
Killing of unopsonized and opsonized GBS strain 78–471 (serotype II) by BMMs. Streptococci were preincubated with various sera, including normal rabbit serum, anti-SCPB serum, and ant-Cps II serum, for 1 h at room temperature. Then 105 streptococci were added to BMMs for 10 min at 37°C. Data are from a single experiment but are representative of those from three independent experiments. Percentage of survival was calculated by using the number of GBS associated with macrophages at the zero time point as 100%.