Guidelines on the Prevention and Control of Tuberculosis in Ireland
Guidelines on the Prevention and Control of Tuberculosis in Ireland
Guidelines on the Prevention and Control of Tuberculosis in Ireland
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<str<strong>on</strong>g>Guidel<strong>in</strong>es</str<strong>on</strong>g> <strong>on</strong> <strong>the</strong> Preventi<strong>on</strong> <strong>and</strong> C<strong>on</strong>trol <strong>of</strong> <strong>Tuberculosis</strong> <strong>in</strong> Irel<strong>and</strong> 2010HSE/HPSCTable 3.2: Risk factors for develop<strong>in</strong>g active TB disease follow<strong>in</strong>g LTBIRisk factorTime s<strong>in</strong>ce <strong>in</strong>fecti<strong>on</strong>AgeDose <strong>of</strong> <strong>in</strong>fecti<strong>on</strong>Size <strong>of</strong> tubercul<strong>in</strong> reacti<strong>on</strong>Predispos<strong>in</strong>g medicalc<strong>on</strong>diti<strong>on</strong>sImmunosuppressivetreatmentImmigrants who haverecently arrived from a high<strong>in</strong>cidence countryBody weightCommentRisk is highest <strong>in</strong> <strong>the</strong> first two years after <strong>in</strong>fecti<strong>on</strong>Inverse associati<strong>on</strong>: Peaks <strong>in</strong> <strong>in</strong>creased risk occur <strong>in</strong> <strong>the</strong> preschool years<strong>and</strong> adolescence/early childhoodRisk higher if <strong>the</strong> source case is smear positive; less if smear negative/culture positive; m<strong>in</strong>imal if culture negativeThe larger <strong>the</strong> reacti<strong>on</strong> <strong>the</strong> greater <strong>the</strong> risk <strong>of</strong> subsequent disease.However, <strong>the</strong>re is a substantial degree <strong>of</strong> variati<strong>on</strong> <strong>in</strong> <strong>the</strong> extent <strong>of</strong><strong>in</strong>creased risk associated with larger tubercul<strong>in</strong> reacti<strong>on</strong>s (table 2.1,chapter 2) 82HIV is <strong>the</strong> str<strong>on</strong>gest risk factor. O<strong>the</strong>r risk factors <strong>in</strong>clude: chr<strong>on</strong>ic renalfailure or receiv<strong>in</strong>g haemodialysis, diabetes, haematological malignancy,jejeunoileal bypass or gastrectomy, silicosis, alcoholism <strong>and</strong> drugaddicti<strong>on</strong> <strong>in</strong>clud<strong>in</strong>g <strong>in</strong>ject<strong>in</strong>g drug users <strong>and</strong> solid organ transplantati<strong>on</strong>Current or recent oral steroids, some cancer <strong>the</strong>rapy, immunosuppressivedrugs, receiv<strong>in</strong>g Tumour Necrosis Factor-α (TNF-α) antag<strong>on</strong>ist treatmentRisk is highest <strong>in</strong> <strong>the</strong> first two years 83;84There is an <strong>in</strong>creased risk associated with be<strong>in</strong>g underweight ormalnourishedReproduced with k<strong>in</strong>d permissi<strong>on</strong> from <str<strong>on</strong>g>Guidel<strong>in</strong>es</str<strong>on</strong>g> for tuberculosis c<strong>on</strong>trol <strong>in</strong> New Zeal<strong>and</strong>. New Zeal<strong>and</strong> M<strong>in</strong>istry <strong>of</strong> Health (2003).Available at www.moh.govt.nz/moh.nsf/pagesmh/2046?Open-28-