N Moyo1, E L Tay2, J T Denholm3. 1. Victorian Tuberculosis Program, Melbourne Health, Melbourne, Victoria, Australia. 2. Communicable Disease Epidemiology and Surveillance, Health Protection, Melbourne, Victoria, Australia. 3. Victorian Tuberculosis Program, Melbourne Health, Melbourne, Victoria, Australia ; Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia.
Abstract
AIM: To review the programmatic use of the tuberculin skin test (TST) following tuberculosis (TB) exposure in Victoria, Australia. METHODS: A retrospective review of data collected for public health surveillance was performed to identify contact demographic factors, including bacille Calmette-Guérin (BCG) status and age and outcomes of TST. RESULTS: Contact tracing was performed for 15 094 people, of whom 13 427 (89.0%) had a TST performed. The TST was positive in 31.4% (95%CI 30.6-32.2) of all contacts, and 48.8% of contacts born outside of Australia. Amongst contacts who were TST-negative at baseline, the conversion rate following exposure was 14.8%. Conversion was most common in those aged 45-54 years, with <12% positivity in both the youngest (<5 years) and oldest (⩾65 years) age groups. Active TB developed in 1.1% of all contacts. Contacts aged <5 years had the highest risk of developing active TB following exposure (3.8%), while low risk was seen in those aged ⩾65 years (0.3%). CONCLUSION: Overall, contact tracing and TST in this setting appear to yield a high proportion of people at risk for the development of active TB. The yield of testing in some groups, particularly those aged ⩾65 years, was low, and investigation of alternative strategies should be considered.
AIM: To review the programmatic use of the tuberculin skin test (TST) following tuberculosis (TB) exposure in Victoria, Australia. METHODS: A retrospective review of data collected for public health surveillance was performed to identify contact demographic factors, including bacille Calmette-Guérin (BCG) status and age and outcomes of TST. RESULTS: Contact tracing was performed for 15 094 people, of whom 13 427 (89.0%) had a TST performed. The TST was positive in 31.4% (95%CI 30.6-32.2) of all contacts, and 48.8% of contacts born outside of Australia. Amongst contacts who were TST-negative at baseline, the conversion rate following exposure was 14.8%. Conversion was most common in those aged 45-54 years, with <12% positivity in both the youngest (<5 years) and oldest (⩾65 years) age groups. Active TB developed in 1.1% of all contacts. Contacts aged <5 years had the highest risk of developing active TB following exposure (3.8%), while low risk was seen in those aged ⩾65 years (0.3%). CONCLUSION: Overall, contact tracing and TST in this setting appear to yield a high proportion of people at risk for the development of active TB. The yield of testing in some groups, particularly those aged ⩾65 years, was low, and investigation of alternative strategies should be considered.
Entities:
Keywords:
bacille Calmette-Guérin; latent tuberculous infection; public health; screening
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