A negative antibody test at 4 weeks will be highly reassuring (90-95% of infected people would be positive), but not as solid as waiting 6 weeks, when virtually 100% have positive results.

• 4周后阴性抗体检测是高度可靠的，（90-95%25的感染者是阳性的）但是在6周后，会有100%25的阳性结果。