Table 3.

Activities categorised by infection risk according to[51]

Category A	Category B	Category C	Category D
Activity, Area
TB ward, specialist lung clinic, specialist lung doctors, micro-biology laboratories that examine sputum	Bronchoscopies, laryngoscopy, emergency intubation, post mortems, work in infection wards, emergency services, A & E, geriatrics and geriatric care*, looking after at-risk groups, deployment abroad in areas with a high incidence	General hospitals	All other health service and welfare work
		General practitioners
		Dental practices
Easing of burden of proof
Yes, index not necessary	Yes, index not necessary	No, index necessary, exceptions are possible	Index necessary
Reasons
Infection risk due to particular patients or materials	Infection risk proven by epidemiological studies	Infection risk insufficiently proven by epidemiological studies. Index may be dispensed with if there are several patients with open TB in the work area.	Infection risk not proven by epidemiological studies

*If there is close contact with patients in need of care.