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Increase in extra pulmonary tuberculosis in England and Wales 1999 - 2006
  1. Michelle Elisabeth Kruijshaar1,*,
  2. Ibrahim Abubakar2
  1. 1 Health Protection Agency – Centre for Infections, United Kingdom;
  2. 2 Health Protection Agency, United Kingdom
  1. Correspondence to: Michelle E Kruijshaar, Respiratory and Systemic Infections, Health Protection Agency - Centre for Infections, 61 Colindale Avenue, London, NW9 5EQ, United Kingdom; michelle.kruijshaar{at}hpa.org.uk

Abstract

Background: Extra pulmonary tuberculosis appears to be increasing in England and Wales. We examined trends in extra pulmonary tuberculosis and factors associated with these trends.

Methods: We used national tuberculosis surveillance data from 1999-2006 for England and Wales, including demographic, clinical and laboratory information. Trends in the proportion of tuberculosis cases with extra pulmonary disease were investigated using the chi-square trend test and associated factors using logistic regression.

Results: Amongst all tuberculosis cases, the proportion with extra pulmonary disease increased from 48% in 1999 (2,717 cases) to 53% in 2006 (4,205 cases, p<0.001). Regression analysis showed that the rise in extra pulmonary disease was associated with an increase in the proportion of non-UK born cases (odds ratio 2.7 [2.6-2.8]). A more than three-fold increase was observed in the proportion of all tuberculosis cases with miliary tuberculosis from 0.7% of all cases (38 cases) to 2.2% (180 cases, p<0.001). This rise was not associated with changes in place of birth nor in any of the other risk factors identified.

Conclusions: The proportion of cases with extra pulmonary disease has increased over the study period. To a large extent this is due to an increasing proportion of non-UK born cases. Reasons for the rise in miliary tuberculosis require further investigation. Clinicians should have a higher index of clinical suspicion of extra pulmonary tuberculosis in non-UK born cases.

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