Text this: National Institute of Health Bulletin No. 173 (continuation of Hygienic Laboratory Bulletin series) I. Leprosy: Two strains of acid-fast bacilli isolated from a case of human leprosy. A comparison with other strains of acid-fast organisms with particular reference to the Lieras bacillius. II. Leprosy: the pathology of experimental rat leprosy. III. Leprosy: variations in the virulence of stains of rat leprosy.