Table 2.

Characteristics of the 18 Hepatitis C Virus Reinfections seen in the Canadian Co-infection Cohort

	Sex	Risk Factor Reported 6 Months Prior to Reinfection	First Positive HCV RNA Value After SVR	Genotype at Baseline	Genotype at Reinfection	Time from SVR to Reinfection (days)	Number of RNA Measures Before/ After Reinfection	Average Time Between Measures (days)	HCV RNA (copies/ mL) Values Post- Reinfection
1	Male	Low-risk MSM, high-frequency IDU	90000	1	Not tested	1281	7/1	183	Subsequent visit undetectable
2	Male	None reported	Detectable (qualitative)	2b	3a	259	2/4	259	All subsequent visits detectable >3 000 000
3	Male	High-frequency IDU	126000	2	1a	925	4/5	308	All subsequent visits detectable > 1 000 000
4	Male	High-risk MSM	Detectable (qualitative)	1a	3a	573	4/12	191	All subsequent visits detectable (qualitative)
5	Male	High-risk MSM	Detectable (qualitative)	1a	3a	370	3/1	185	Subsequent visit detectable (qualitative)
6	Male	Low-risk MSM	Detectable (qualitative)	3a	1	698	2/2	698	All subsequent visits detectable > 900 000
7	Female	High-frequency IDU	Detectable (qualitative)	1a	3a	1297	8/2	185	All subsequent visits detectable (qualitative)
8	Male	High-frequency IDU	Detectable (qualitative)	2b	1a	1309	6/4	262	All subsequent visits detectable (qualitative)
9	Male	High-frequency IDU	Detectable (qualitative)	3a	Not tested	1115	4/1	372	Subsequent visit undetectable
10	Male	High-risk MSM	Detectable (qualitative)	1a	Not tested	1088	7/4	181	All subsequent visits undetectable
11	Male	High-frequency IDU	26000	3a	1a	548	2/2	274	Subsequent visits detectable > 26100
12	Female	None reported	1400000	3a	1	719	3/1	360	Subsequent visit detectable at 5 000 000
13	Male	None reported	Detectable (qualitative)	3	3a	350	3/1	175	Subsequent visit detectable at 9000
14	Male	Low-risk MSM	27000	1a	1a	1167	6/2	233	All subsequent visits detectable > 242000
15	Male	None reported	Detectable (qualitative)	3a	Not tested	169	2/1	169	Subsequent visit undetectable
16	Male	Low-frequency IDU	178	Unknown	3a	1063	6/1	213	Subsequent visit undetectable
17	Male	High-frequency IDU	412000	1a	1a	1396	5/1	349	Subsequent visit detectable at 1500
18	Male	High-frequency IDU	531000	1a	1a	549	2/1	549	Subsequent visit detectable at 322000

Abbreviations: HCV, hepatitis C virus; IDU, injection drug use; MSM, men who have sex with men; SVR, sustained virologic response.