Question

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

Explanation:

Hand - washing is a crucial infection - control measure for healthcare workers. They should wash hands before providing care to prevent introducing pathogens to patients and between patients to avoid cross - contamination. Visible dirt is not the only trigger for hand - washing. Fixed time intervals like every 20 minutes are not the standard protocol, and just washing at the start of the workday is insufficient.

Answer:

Before providing care and between patients