Table 5. Performance of Ewha Center for Vaccine Evaluation and Study for the analysis of 5 calibration sera-shown is the number of sera whose assayed value has a percent error ≤ 40%.

Value	PnPS
	4	6B	9V	14	18C	19F	23F	All types
No. of serum samples (%)	5/5 (100)	3/5 (60)	5/5 (100)	5/5 (100)	5/5 (100)	5/5 (100)	4/5 (80)	32/35 (91)

PnPS = pneumococcal polysaccharide.