Data and samples were collected from wild badgers living in the Woodchester Park study area, a 7 km2 region of Cotswold limestone escarpment in Gloucestershire, south-west England (51°43′N, 2°16′W). The resident population of badgers (approximately 300 individuals in 26 social groups) has been the subject of long-term research into badger ecology and TB epidemiology, details of which are given elsewhere [29] . Badgers were captured in the immediate vicinity of their setts in peanut-baited cage traps and transported to a sampling facility to be anaesthetised and examined. All animals were anaesthetised by intramuscular injection of a combination of 8 mg/kg ketamine hydrochloride (Vetalar; Pfizer Ltd, Sandwich, UK), 0.04 mg/kg medetomidine hydrochloride (Domitor; Pfizer Ltd) and 0.8 mg/kg butorphanol tartrate (Torbugesic; Fort Dodge Animal Health, Southampton, UK) [30] . They were then sexed, weighed and measured. On first capture each badger was given a unique identifying tattoo on its ventral abdomen [31] which allowed individuals to be identified thereafter. Samples of faeces, urine, tracheal aspirate, oesophageal aspirate and swabs from bite wounds (where present) were collected for mycobacterial culture and up to 12 ml of jugular blood was taken for serological and gamma interferon testing (see below). After recovery from anaesthesia, badgers were released at the site where they had been captured. Each social group was trapped four times per year. The present study used data derived from 875 capture events that occurred between July 2006 and December 2008, which represented 305 individual badgers (130 male, 175 female) from 26 social groups. Of the badgers caught, individuals were sampled on average three times (range 1 to 10) during the study period. All diagnostic tests gave conclusive results on each of the 875 sampling sessions included in the dataset.
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