In the USA is is the law. Medical issues are private matters between a healthcare provider and patient. If a person's private information was to "get out" it might affect their ability to get a job or they might face other predjudices Also the private insurance numbers could be used to steal someone's identity.
Most caregivers should be able to work and understand a variety of health concerns and basic hygiene like; most common health problems, heart levels, fragile body parts, how to properly clean others, etc.
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