Table 1.

Specification of the behaviors required for delivery of household TB contact investigation.

Specification domain	Contact investigation behaviors
	Agree to contact investigation	Screen contacts for TB	Complete TB evaluation
Who needs to perform the behavior?	Index TB patients	Lay health workers	Household contacts
With whom do they need to do it?	Health workers	Household TB contacts	With other household TB contacts who require TB evaluation or by themselves
What do they need to do?	Agree to contact investigation and schedule a home visit for TB screening of household contacts	Interview contacts about TB symptoms and predisposing factors for TB	Complete TB diagnostic evaluation and initiate treatment for TB if TB is confirmed
When do they need to do it?	As soon as possible after TB diagnosis	When one or more contacts are available	As soon as possible when the services are available
Where do they need to do it?	At the clinic or by phone	In the home or possibly by phone	At the clinic or wherever testing is offered
How often do they need to do it?	Once	Once	Regularly until TB diagnostic evaluation is complete

TB, tuberculosis.

The table specifies the characteristics of each of the required behaviors in contact investigation.