Which illnesses must be reported to a supervisor?

Other answer:

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Support Tech:
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Who the hell knows?

Are you referring to illnesses that must be reported to public health?
Are you referring to illnesses of children in child care facilities?
Are you referring to health care workers?

No one here knows which illness of WHOM you're referring to. No one even knows what country you're in. We do not have ESP.

I assume you mean sort of things that may affect you at work? Things like epilepsy, diabetes etc?
If it is a manual job (e.g heavy lifting) then any injuries that could affect your work or caue you further injury should probably be mentioned.