Needle-sharing among drug users often leads to HIV transmission because

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Needle-sharing among drug users can lead to HIV transmission because needles may be contaminated with blood that contains HIV. HIV can survive outside the body for a short time, and sharing contaminated needles can introduce the virus directly into the bloodstream of the recipient. This is especially dangerous because drug users' immune systems are often weakened, increasing the risk of HIV infection and other diseases.

Needle-Sharing Among Drug Users Often Leads to HIV Transmission Because