About the TB stats Dashboard

v1 of the TB stats dashboard created by Dr Andrew Robertson as part of a University of Exeter Knowledge Exchange project funded by NERC. v2 modified and maintained by Defra. The dashboard uses the latest national statistics on tuberculosis (TB) in cattle in Great Britain published by Defra here. We encourage our users to engage with us so we can improve our National Statistics. Feedback can be sent to: tbstatistics@defra.gov.uk

This page displays headline TB statistics for the area selected. To select a different region use the menus to the right. Data can be displayed for all counties in England, Wales and Scotland. For a map of the different TB regions in England go to the TBhub website. Note that changes in TB statistics from one year to the next may occur due to changes in TB testing and surveillance, as well as changes in cattle disease levels.

Short term changes in these statistics should be considered in the context of long term trends.

.

Dashboard version 2.1 published on

2021-11-30

England Bovine TB Quarterly Overview

This document has been designed to complement the National Statistics release available at: www.gov.uk/government/statistics/incidence-oftuberculosis-tb-in-cattle-in-great-britain All statistics are reported on the new Edge area basis. We encourage our users to engage with us so we can improve our National Statistics. Feedback can be sent to tbstatistics@defra.gov.uk

A - Herd Incidence: New herd incidents per 100 herd years at risk of infection

B - Herd prevalence: Disease restricted herds as a percentage of registered herds

A2 - New Herd Incidents

B2- Herds not OTF at the end of the period due to a bovine TB incident

C - Total animals slaughtered

D - Total cattle tests

Glossary


Restricted cattle herds
Cattle herds under TB restrictions at the end of the month/year.


Total cattle herds
All active cattle herds registered with APHA.


Herd prevalence
The percentage of all cattle herds that are under TB restrictions at the end of the month/year. The prevalence of a disease is the proportion of a defined population affected by that disease at a designated point in time.


Headline incidence
New herd TB incidents per “100 herd years at risk of infection” during the year. The incidence of a disease is the rate at which new cases occur in a defined population over a designated time period. This measure of herd incidence is more accurate because it takes into account the amount of time cattle herds tested during the period of interest were unrestricted and therefore at risk if infection. To find out more about how this measure of herd incidence is calculated, see “Herd incidence methodology paper” at .


OTFW incidence
New herd TB incidents where officially TB free status is withdrawn (OTFW) per 100 herd years at risk of infection during the year.


Cattle tests
Number of TB tests on cattle . Does not equal number of animals tested as an individual animal could be tested more than once in each time period. Interferon-gamma blood tests used to supplement the skin test in known infected herds are included, rather than as a standalone test.


Herd tests

Herds where tuberculin skin testing is carried out on at least one animal in the herd . Excludes:
• Pre- and post-movement tests - see www.gov.uk/government/statistics/latest-official-statistics-on-pre-movement-and-post-movement-testing-for-tuberculosis-tb-in-cattle-in-great-britain-quarterly
• Interferon-gamma blood tests
• Private tests.

Includes surveillance or control test triggered by a herd-level event, rather than a test triggered for an individual animal or a small group of animals within a herd.


Officially TB free (OTF) herds tested
Any skin test carried out in an OTF herd during the period shown. Excludes: Pre- and post-movement tests, interferon-gamma blood tests, short interval tests, private tests, TB unit tests.


New TB incidents

New herd incidents (NHI). Herds which were previously OTF but either had
• one or more cattle that reacted to a tuberculin skin test or
• one or more animals with suspect lesions of TB detected at slaughter by routine meat inspection (slaughterhouse case)


New TB incidents where officially TB free herd status withdrawn (OTFW)

OTF is withdrawn either because:
• Lesions typical of TB detected at post-mortem inspection of test reactors or inconclusive reactors, or
• Tissue samples from one or more reactor, inconclusive reactor or slaughterhouse case produce positive culture results for M bovis.


New TB incidents where: officially TB free herd status suspended (OTFS)
OTF suspended because of reactors in the herd, but post-mortem evidence of TB is not detected. Status remains suspended until further herd tests completed with negative results.


Total animals slaughtered
All bovine animals compulsorily slaughtered for TB control reasons. It comprises of skin test reactors, interferon-gamma positive animals and direct contacts (DC) slaughtered in England, Wales and Scotland . In Wales it also includes inconclusive reactors (IR) slaughtered.


Reactors slaughtered
All animals compulsorily slaughtered because they were reactors to the tuberculin skin test and/or tested positive to the interferon-gamma blood test.


Wales inconclusive reactors slaughtered
The statistics are for Wales only and start at April 2017. Inconclusive reactors are animals showing positive reactions to bovine tuberculin that are not strong enough for them to be deemed reactors .In Wales, some IRs in persistent breakdown herds are automatically removed with compensation paid.


Direct contacts (DCs) slaughtered
An animal in an OTFW incident that, although not a test reactor, was considered to have been exposed to M bovis and compulsorily slaughtered.


Suspect slaughterhouse cases reported to APHA
An animal with suspect lesions of TB detected at slaughter by routine meat inspection. These animals are not reactors or DCs.


Slaughterhouse cases confirmed
Slaughterhouse cases where laboratory culture of the suspect TB lesions has identified M. bovis.