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Table 2 The mean number of subsequent clustered cases, stratified by the HIV status, site of disease and smear status of the first case

From: The impact of HIV infection on tuberculosis transmission in a country with low tuberculosis incidence: a national retrospective study using molecular epidemiology

Site of disease and smear status HIV status of first case
HIV-negative
Mean (SE)
HIV-positive
Mean (SE)
Total
Mean (SE)
Pulmonary smear positive 1.1 (0.02) 0.6 (0.07) 1.1 (0.02)
Pulmonary smear negative/unknown 0.8 (0.01) 0.9 (0.07) 0.8 (0.01)
Extra-pulmonary disease 0.6 (0.01) 2.5 (0.14) 0.7 (0.01)
Total 0.8 (0.01) 1.3 (0.05) 0.8 (0.01)
  1. Mean: arithmetic mean. SE: standard error of the mean (Poisson distribution)
  2. Patients with both pulmonary and extra-pulmonary disease were classed as having pulmonary disease