Needles, syringes, scalpels and blades are disposed in:

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart B (pp 233-449 of 464) p. 109-111
E6 Nursing Fundamentals Taylor p. 180-182
Practise the full OSSSC Nursing Officer-2021
Attempt every question from this paper in a timed mock, then review the full solution for each one.