The prevalence of transfusion transmitted virus infection in blood donors

Table 1 The results of TTV DNA detected by PCR in sera of blood donors

Blood donors	No. of sample	TTV DNA (+)
		n	%
Commercial blood donors with normal ALT levels	209	48	23.1
Volunteer blood donors with normal ALT levels	204	30	14.4
Blood donors with elevated ALT levels	58	18	31.0

Table 2 The results of TTV DNA detected by PCR in sera of the patients with liver diseases and hemodialysis

Patients	Cases tested	TTV DNA (+)
		n	%
Non-A to E hepatitis patients	36	15	41.6
Hepatitis A patients	13	1	7.7
Hepatitis B patients	13	3	23.1
Hepatitis C patients	43	8	18.6
Hemodialysis	12	5	41.7

Table 3 Homologies of nucleotide sequences among isolates from blood donors of Japan and China (%)

TTV isolates	AB008394	TTVCHN1	Case 1	Case 2	Case 3	Case 4
TTVCHN1	98.7
Case 1	98.4	99.7
Case 2	97.7	99.1	99.4
Case 3	97.7	99.1	99.4	98.7
Case 4	98.4	99.7	99.4	98.7	98.7
Case 5	98.1	99.4	99.1	98.4	98.4	99.1