Final answer:
Needles are to be used once and then discarded to prevent infections, with health-care workers taking stringent precautions including using disposable syringes and needles to avoid exposure to potentially infectious body fluids.
Step-by-step explanation:
Health-care workers, including those at higher risk of needle sticks, such as phlebotomists and dentists, as well as populations vulnerable to infections, like drug addicts, should adhere strictly to single-use practices regarding needles.
After a single use, needles must be discarded to prevent the transmission of diseases, for instance, Hepatitis B virus (HBV). Blood poses the greatest risk of transmitting infections, but other body fluids are also a concern. Health-care professionals are advised to wear gloves and face protection, avoid contact with body fluids, use disposable syringes and needles, and follow protocols for exposure treatment and disinfection.