Thoracic radiographs (SP VET 3.2, Xograph Ltd) were acquired using mammography film (Xograph Imaging Systems Ltd, Tetbury, UK) before and every 2 weeks after exposure to M. tuberculosis. Evaluation of disease was performed by an experienced consultant thoracic radiologist blinded to the exposure dose and clinical status using a pre-determined scoring system based on the amount and distribution of infiltrate as previously described [31].
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