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Efficacy of BCG vaccination against two representative Beijing strains. Guinea pigs were inoculated with saline [squares] or BCG Pasteur [circles] and the bacterial load in target organs measured 30 and 60 days later. Data shown as log mean numbers in target organs ± SEM [n=5]. Also shown is representative lung pathology in guinea pigs inoculated with saline [sham] or BCG and challenged with two Beijing strains. Hematoxylin and eosin staining. Low power whole organ scan.
