Table 4. Proven cases with adverse transfusion reaction investigated by the trace back system in Korea, 2006-2014.

Patient No.	Adverse reactions	Underlying disease	Screened donor sample	Follow-up donor sample	Screened N of donor	Transfusion-reported year
1	HBV infection	Neuroblastoma	HBs Ag (-)	HBs Ag (+)	356	1999-2006
2	HCV infection	HNP	Anti-HCV Ab (-)	Anti-HCV Ab (+), PCR (+)	55	2001-2006
3	HCV infection	Neuroblastoma	N.A.	Anti-HCV Ab (+), PCR (+)	126	2005-2006
4	HCV infection	Chronic cholangitis	Anti-HCV Ab (-)	Anti-HCV Ab (+), PCR (+)	60	1991-2007
5	Malarial infection	Rectal cancer	Anti-malaria Ab (+), PCR (+)	N.A.	3	2006-2007
6	Malarial infection	Tuberculosis, pancreatic cancer	Anti-malaria Ab (+), PCR (+)	N.A.	7	2006-2007
7	Malarial infection	Orthopediatric operation	Anti-malaria Ab (+), PCR (+)	N.A.	36	2008-2008
8	Bacterial infection	AML	Staphylococcus aurerus (+)	N.A.	1	2011-2011
9	Bacterial infection	MDS	S. aurerus (+)	N.A.	1	2013-2013
10	TRALI	Malignant lymphoma	N.A.	N.A.	1	2009-2009
11	TRALI	Gastric cancer	N.A.	N.A.	1	2009-2009
12	TRALI	Acute cholangitis	N.A.	N.A.	1	2013-2013
13	AHR	Laminectomy (B+)	A+	N.A.	1	2009-2009

Abbreviations: AHR, acute hemolytic transfusion reaction; HBV, hepatitis B virus; HBs, hepatitis B surface; Ag, antigen; Ab, antibody; HCV, hepatitis C virus; HNP, herniated nucleus pulposus; N.A., not analyzed; TRALI, transfusion-related acute lung injury.