It depends: If someone always only uses their own needles and works and never shares (no backloading, etc), they won't get HIV or hepatitis c. If someone always uses condoms with sex and takes post-exposure prophylaxis if the condom breaks their risk is low. So harm reduction is key. Idu is more efficient for HIV transmission than sex, although unprotected anal sex will transmit HIV in 1 of 100 times.
Answered 6/10/2014
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