4.4.1.798 ValueSet http://hl7.org/fhir/ValueSet/group-involvement

The first case that is the reason for creating the group. Usually the first known infection, but other kinds of first are known.

Patient is included in the list on the grounds of being a primary exposure case (sometimes, but not neceessarily, direct exposure to the index case, or a known infected person).

Patient is included in the list on the grounds of being a secondary exposure case - that is, exposed to a potentially infected patient or person of interest.

Household member is a legally / officially registered owner of the dwelling that contains the household. Or at least, considers themselves the rightful owner.

Household member is a resident - that is, they consistently reside in the dwelling.

Household member is transiently visiting the dwelling during (part of) the period of interest, or, for a workplace, a person who was/is in the workplace but not an employee

Household member is a member of the staff working in the dwelling (and by implication, not a resident).

Group member is animal kept as a pet by the family/household.

This is the group member's primary workplace on a consistent basis.

The group member works in the workplace, but on an occasional basis.

The group member was working in the workplace, but is not consistently present.