Table 2. Probable HCV transmission events identified by using phylogenetic analysis, spatiotemporal information, and risk behavior information, New South Wales, Australia, 2005–2012*.

Cluster	Transmission, participant ID no.	Period of co-location	Prison ID†	Patient ID	Est. date of infection	HCV genotype	ATSI	Continuously in prison‡	Equipment sharing§	OST§	Heroin use§
A	315 → 117	2007 Dec 31–2008 Jan 22	AT	315	2007 Oct 30	1a	No	Yes	Yes	No	No
				117	2008 Feb 27	1a	No	No	Yes	No	Yes
	315 → 461	2008 Jun 29–Jul 11	AE	315	2007 Oct 30	1a	No	Yes	Yes	No	No
		2008 Sep 24–Oct 1		461	2008 Oct 6	1a	No	No	Yes	No	Yes
B	304 → 357	2007 Oct 26–Nov 23	AB	304	2007 Apr 17	3a	No	No	No	No	No
				357	2008 Nov 11	3a	No	Yes	Yes	No	Yes
C	302 → 426	2008 Dec 9–18	AP	302§	2007 Oct 11	3a	Yes	No	Yes	No	No
				426	2008 Dec 21	3a	Yes	No	Yes	Yes	No

*All prisoners were injection drug users during the period of co-location. ATSI, Aboriginal and/or Torres Strait Islander descent; est., estimated; HCV, hepatitis C virus; ID, identification; OST, opioid substitution therapy.
†Prisons are identified by codes for de-identification purposes.
‡Continuously in prison 6 mo before estimated date of infection.
§Female patient. All others were male.