According to WHO recommendation in COVID 19 pandemic, generally children aged 5 years and below should wear which type of mask?

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 10-12
Practise the full KPSC Staff Nurse - 2021
Attempt every question from this paper in a timed mock, then review the full solution for each one.