Bovine TB in Dyfed

15 Feb 2020

Jones, T. O.

Vet Record Image

According to the AHPA’s response to a Freedom of Information request, 8995 cattle TB reactors from farms in Dyfed were slaughtered during 2018 and up to the end of June 2019 (VR, 25 January 2020, vol 186, p 81). Only six (0.067%) were found to have TB lung lesions postmortem, while 1019 (11.3%) showed other lesions. It is not clear if all reactors were examined postmortem, or how comprehensibly. Neither the location of lesions within lungs nor the sites of ‘other lesions’ are specified. Nor is there reference to results of mycobacterial culture of specimens confirming Mycobacterium bovis infection.

Bovine TB (bTB) lung lesions in cattle can result from M bovis being orally ingested or inhaled. Lesions in anterior lobes indicate blood borne infection via lymph from gut mucosa; those in diaphragmatic lobes from inhaled infection.1 The former can progress to resemble the latter.1