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a form of leprosy that is very unstable immunologically; the cutaneous nerves frequently contain bacilli, but the lepromin test is usually negative; cutaneous lesions are composed of flat bands or plaques.
borderline leprosy A term for one of two presentations of leprosy, borderline tuberculous leprosy—in which there are a smattering of reactive granulomas with scattered large, sharply demarcated, hairless anaesthetic plaques—and borderline lepromatous leprosy—characterised by skin nodules filled with numerous bacilli.
disease pathogenic entity characterized by an identifiable aetiological agent, group of signs and symptoms and/or consistent anatomical alterations; see syndrome
HLA B27 a human leukocyte antigen (HLA); there is a strong association between HLA B27 tissue type and incidence of Reiter's syndrome and other sero-negative arthropathies