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What is the Risk of Disease Transmission when Sharing a Syringe but Switching Needle?
Sharing a syringe (even with changing the needle) is never recommended. Even if the risk of transmitting diseases is small, the risk is still present and not worth it. There are half syringes that can be purchased as opposed to using the same syringe for two different people. This is not a safe practice whatsoever.
Clinical Context
When a syringe is used on one person, small amounts of blood or tissue fluid can be pulled back into the needle and even into the syringe itself during injection. Simply swapping the needle only cleans the point that touches the skin — it doesn't remove contamination that may have reached the syringe body or leftover medication inside. That's why a fresh, unused syringe and needle are required for every patient, no exceptions.
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