Comparison of yield and relative costs of different screening algorithms for tuberculosis in active case-finding: a cross-section study

Table 2 The screening procedure through algorithm WHO 1a/1c, 2, and 3

Algorithm	Household primary screening			Chest X-ray	Smear	Culture
	1)	2)	3)
WHO 1a	✗				✗	✗
WHO 1c	✗			✗	✗	✗
2	✗	✗		✗	✗	✗
3	✗	✗	✗	✗	✗	✗

(1) cough lasting longer than two weeks; (2) hemoptysis or bloody sputum; (3) cough longer than one week yet less than two weeks, and accompanied with any of the following symptoms: fever, night sweats, chest pain, loss of appetite, fatigue, or weight loss(> 3 kg)

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