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

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

Site of disease^† and smear status	HIV status of first case
Site of disease^† and smear status	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)

Mean: arithmetic mean. SE: standard error of the mean (Poisson distribution)
^†Patients with both pulmonary and extra-pulmonary disease were classed as having pulmonary disease

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