"Seventeen percent (17%) of inmates reported recently injecting drugs. A substantial proportion of these inmates increased their risk of acquiring a blood-borne infection (BBI) by using someone else’s used injecting equipment (see Table 4 for gender-specific estimates). Of those who recently injected drugs, 37% of inmates reported sharing a needle with a person with a positive or unknown BBI status and 42% reported using someone else’s works after they had used them. Additionally, men were more likely than women to report using someone else’s used needle, 55% vs. 41%, ?2 (1, n=438) = 6.22, p < 0.05 and sharing works with a person with a positive or unknown BBI status, 33% vs. 23%, ?2 (1, n=397) = 4.40, p < 0.05."

Source

Thompson, Jennie, Zakaria, Dianne, and Jarvis, Ashley, "Use of bleach and the methadone maintenance treatment program as harm reduction measures in Canadian Penitentiaries 2010," Correctional Service of Canada, Research Report R-210, August 2010.
http://www.csc-scc.gc.ca/text…