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 Bovine TB in GB. Latest SAM data, maps and older VETNET data.
Added or updated 4 days ago
PDF icon Wildlife management and zoonotic infections. A one day symposium held at The Royal Society of Medicine, London on 17 November 2010.
Added or updated 5 days ago
 Gassing of badger setts
Added or updated 6 days ago
PDF icon Badgers prefer cattle pasture but avoid cattle: implications for bovine tuberculosis control. R Woodroffe et al. Ecology Letters. 2016.
Added or updated one week ago
PDF icon Programme for the eradication of bovine Tuberculosis, bovine Brucellosis or sheep and goat Brucellosis (B. melitensis) for obtaining EU cofinancing. Submitted by the Republic of Ireland on 28th May 2015.
Added or updated 3 weeks ago
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PDF icon Post-mortem Examination of TB Reactors (R), Inconclusive Reactors (IRs) and Direct Contacts (DCs): PRELIMINARY RESULTS
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 An example of how badger culling in the UK is being cast in a negative light
Added or updated one month ago
PDF icon Standard requirements for the submission of programme for eradication, control and monitoring. Submitted 21 Sep 2016 by Rosanne Greene of DAFM of the Irish Republic to the European Commission.
Added or updated one month ago
PDF icon Ireland to be bovine TB free by 2030 under new Government plans - FarmIreland.ie. @farm_ireland. May 10 2018 6:00 AM
Added or updated one month ago
PDF icon Differences between bovine TB indicators in the IAA and the Comparison Area. First six years, 1st May 2010 to 30th April 2016.
Added or updated 2 months ago
PDF icon Results of Badger Vaccination Modelling Report. 3 February 2016. Rebecca Evans, Deputy Minister for Farming and Food.
Added or updated 2 months ago
 Bovine TB in Ireland
Added or updated 2 months ago
PDF icon Badgers removed in the Irish Republic
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PDF icon Bovine TB Eradication Programme IAA Vaccination Project - Year 4 Report
Added or updated 2 months ago
PDF icon Laboratory Analysis of TB Reactors (R) / Inconclusive Reactors (IRs) and Direct Contacts (DCs) to the Tuberculin Test. APHA. 12/04/2018.
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 Data needed to achieve meaningful results in the 2013 badger culls
Added or updated 2 months ago
PDF icon Badger Culling in England By R Giesler et al. House of Commons Library. BRIEFING PAPER Number 6837, 12 April 2018.
Added or updated 2 months ago

Prevalence of latent TB in English dairy farmers

When a farmer has a TB breakdown in his herd, depending on the severity of the breakdown and whether the infection is confirmed, Public Health England offer to perform tests on the farmer and his family. This includes a skin test as applied to his cattle which checks for latent TB. The skin test checks if the recipient has been infected with the TB bacteria by measuring inflammation of the skin in response to injected TB proteins. When the farmer's cattle test positive to the skin test the farmer's cattle are destroyed. However when a human tests positive to skin5 (or blood4) tests, the data is not even collected. This is according to replies received in Reference 1 from Public Health England. This suggests that in England there is poor awareness of the proportion of people with latent TB and how this proportion may be growing.

An animal with latent TB infection does not feel sick and does not have any symptoms3. According to Reference 2, 5-10% of humans, who are detected to be latently infected with TB, develop clinical tuberculosis during their lifetime. About half of those people who develop active TB are thought to do so within the first two years of infection3. It would appear that Human Health only collate the number of cases for active TB and this number obviously depends on how well TB is being diagnosed.

How may this be relevant?

From the point of view of the general public, if Human Health were to collate the results of performed latent TB tests and make this data available to the public, with notes on how to interpret this data, the public would be better informed of what the risks actually are. This would reduce speculation and uncertainty.

Regarding managing the disease, a clear picture of trends in latent TB would give an earlier warning than obtained from trends in active TB so that, if necessary, appropriate action could be taken in earlier years.

References

  1. Proportion of English dairy farmers who test positive to the TB skin test. Freedom of Information request to Public Health England. May 2013.
  2. Bovine TB Special Edition. Government Veterinary Journal. VOLUME 16,NO.1,2006.
  3. The Difference Between Latent TB Infection and TB Disease. Centers for Disease Control and Prevention. Division of Tuberculosis Elimination. Page last reviewed: 1st September 1 2012.
  4. Interferon Gamma Release Assay (IGRA) testing for tuberculosis (TB) - Questions & Answers (Q&As). For Health Care Workers. HPA Tuberculosis Programme Board. DRAFT FOR CONSULTATION. October 2007.
  5. Targeted Tuberculin Testing and Treatment of Latent Tuberculosis Infection. An adaptation of a report published in the American Journal of Respiratory and Critical Care Medicine 2000;161:S221--S247. June 2000.

Other references

  1. An update on Dianne Summer's illness - identified as the same spoligotype as her dead alpacas. bovinetb.blogspot.co.uk. 14th April 2013.
  2. Public health and bovine tuberculosis:what's all the fuss about?
  3. Prevalence of Latent and Active Tuberculosis among Dairy Farm Workers Exposed to Cattle Infected by Mycobacterium bovis. PLoS Negl Trop Dis. 2013 April; 7(4): e2177. Published 25th April 2013.
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