Table 1. B19V DNA prevalence in plasma donors from four Chinese provinces between 2018 and 2021.

Blood products manufactures	Areas of plasma samples	Samples detection (n)	B19 DNA positive (n)	Prevalence of B19V DNA (%)	95% confidence interval [CI]
A	Sichuan	2,000	1	0.05	0.00 ∼ 0.15
B	Guangxi	3,898	18	0.46	0.24 ∼ 0.66
C	Shandong	3,985	13	0.33	0.15 ∼ 0.50
D	Guizhou	7,304	12	0.16	0.07 ∼ 0.26
Total	/	17,187	44	0.26	0.18 ∼ 0.33