Exposures and potential risk factors for acute hepatitis C; bold if included in multivariable analysis.

§AI = anal intercourse;§§BDSM = bondage, dominance/submission, sadism/masochism;*UAI = unprotected AI with non-steady partners of unknown HIV serostatus;**PDE-5 = phosphodiesterase-5: The risk of penile (rectal) trauma is higher if intercourse is temporally extended by (the partner's) use of PDE-5 inhibitors;***NADs = nasally-administered drugs (cocaine, amphetamines, ketamine, etc.);†frequently or always when having sex.