Question

when should healthcare workers wash their hands?
only when they are visibly dirty
before providing care and between patients
every 20 minutes
at the beginning of the work day

Explanation:

Hand - hygiene is crucial for healthcare workers to prevent the spread of infections. Washing hands before providing care and between patients helps reduce the transfer of pathogens from one patient to another or from the environment to the patient. Visible dirt is not the only indicator for hand - washing. Fixed time intervals like every 20 minutes are not as practical as task - based hand - washing, and just washing at the start of the workday is insufficient.

Answer:

Before providing care and between patients