39. Reporting on AFB Microscopy Number of bacilli seen Result reported None per 100 oil immersion fields Negative 1-9 per 100 oil immersion fields Scanty, report exact number 10-99 per 100 oil immersion fields 1+ 1-10 per oil immersion field 2+ > 10 per oil immersion field 3+
40. Proportion of patients with pulmonary TB who have positive AFB smears AFB positivity in TB patients 0 10 20 30 40 50 60 70 HIV Negative Early HIV Late HIV
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42.
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45. Microscopy is more objective and reliable than X-ray Inter-observer agreement
46. Microscopy is a more specific test than X-ray for TB diagnosis Specificity
47. Diagnosis of Pulmonary TB Cough 3 weeks AFB X 3 Broad-spectrum antibiotic 10-14 days If symptoms persist, repeat AFB smears, X-ray If consistent with TB Anti-TB Treatment If 1 positive , X-ray and evaluation If 2/3 positive : Anti-TB Rx If negative :