Table 2. Prioritizing contacts for testing according to the classification table as suggested by the national guidelines.

			Period of contact
Intensity	Size of location ofexposure is comparablewith*	Estimated volume or location	Prolonged	Less prolonged
			Daily or>48 hours	Weekly or 6–48 hours	Incidentally or 1–6 hours	Sporadic or <1 hours
Close	Car	<5 m3	1	1 and 2	2	2
	Room	10–30 m3	1	2	2	2 or 3
Less close	Classroom/office**	100–200 m3	2	2 or 3	3	3
	Closed room bigger than ahouse**	>200 m3	2	3	3	3 or other

(1 = close contact, 2 = casual contact, 3 = community contact).

^*Accounting for survival of Mycobacterium tuberculosis (air refreshment and circulation) and ventilation.

^**Use ‘room’ if the contact have been exposed to the index case within a distance of <1–2 m in this location.