Volume 11 Supplement 1

16th Interntional Conference on Human Retroviruses: HTLV and Related Viruses

Open Access

HTLV-1 associated bronchiectasis among Indigenous Australians is associated with higher HTLV-1 proviral loads: Results of a prospective case-control study

  • Lloyd Einsiedel1Email author,
  • Olivier Cassar2, 3,
  • Emma Goeman4,
  • Tim Spelman1 and
  • Antoine Gessain2, 3
Retrovirology201411(Suppl 1):P28

https://doi.org/10.1186/1742-4690-11-S1-P28

Published: 7 January 2014

Infection with HTLV-1 is associated with bronchiectasis in Indigenous Australians. Previous studies have not determined HTLV-1 proviral loads (pvl), which predict risk of other HTLV-1 associated inflammatory diseases, such as HTLV-1 associated myelopathy. Thirty-six Indigenous adults admitted to Alice Springs Hospital, June 2008 to December 2009, with radiologically confirmed bronchiectasis, but no other HTLV-1 related disease, were prospectively recruited and matched by age and sex to 36 controls of the same ethno-geographic origin. Case notes were reviewed from date of birth or first admission to date of recruitment. HTLV-1 subtype C pvl were determined at the Pasteur Institute, Paris. HTLV-1 infection was more common among cases (25/36; 69.4%) than their controls (15/36; 41.7%)(p<0.018). Two cases were admitted in childhood with probable infective dermatitis and two with recurrent strongyloidiasis unresponsive to treatment with thiabendazole. In adulthood, cases (25/36; 69%) were more likely than controls (5/25; 20%) to have positive or borderline strongyloides serology (p<0.001). The mean HTLV-1 pvl (±SEM) was significantly higher for cases (0.83±0.21% PBMC) than controls (0.12±0.05% PBMC)(p=0.016) and was nearly17 fold-higher compared to controls in which bronchiectasis was excluded by HRCT (0.05±0.02% PBMC; p=0.006). Twelve cases (33.3%) and 5 controls (13.9%) died during 3 years of follow-up (p<0.052). Cases died at a younger age (cases, 49±15; controls, 60±13)(p=0.15). In both groups HTLV-1 infected patients were more likely to die: cases, 11/12 (92%); controls, 4/5 (80%). HTLV-1-associated bronchiectasis is associated with higher HTLV-1 pvl suggesting that this condition results from an HTLV-1 driven inflammatory process.

Authors’ Affiliations

(1)
Flinders University/Northern Territory Rural Clinical School, Alice Springs Hospital
(2)
Département de Virologie, Institut Pasteur, Unité d’Epidémiologie et Physiopathologie des Virus Oncogènes
(3)
CNRS
(4)
Department of Paediatrics, Alice Springs Hospital, Northern Territory

Copyright

© Einsiedel et al; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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