Elevated levels of C-reactive protein and elevated erythrocyte sedimentation rates are useful in supporting the clinical diagnosis of T2R [46], [47], [48]. A histological examination may not provide confirmation of T1R, and the diagnosis must often be made on clinical grounds alone. It is generally agreed that the average incubation period is between three and ten years [29]. A search of more than 50 fields was required to find the two organisms shown in a cutaneous nerve in the TT sample. The affected nerves are thickened, tender, or both. DNA taken from the shrouded remains of a man discovered in a tomb next to the old city of Jerusalem shows him to be the earliest human proven to have suffered from leprosy. Lepromatous patients present with several skin lesions with a preponderance of CD8+ T cells in situ, absence of granuloma formation, high bacterial load, and a flattened epidermis [48]. Other SNPs to be associated with disease and/or the development of reactions in several genes, such as vitamin D receptor (VDR), TNF-α, IL-10, IFN-γ, HLA genes, and TLR1 are also suggested [14–17]. Though nonfatal, leprosy is one of the most common causes of nontraumatic peripheral neuropathy worldwide. TNF-α may augment the immune response towards the elimination of the pathogen and/or mediate the pathologic manifestations of the disease. This infection is usually observed in cutaneous nerves, but is also seen in biopsies of the sural nerve or a sensory branch of the radial cutaneous nerve. The patient was treated with the MDT regimen recommended by the National Hansen’s Disease Programs (USA): daily rifampin, dapsone, and clofazimine. Phagocytosis of M. leprae by monocyte-derived macrophages can be mediated by complement receptors CR1 (CD35), CR3 (CD11b/CD18), and CR4 (CD11c/CD18) and is regulated by protein kinase [40, 41]. T2R is widely believed to be an immune-complex-mediated disorder [23], although the evidence is circumstantial. M. lepromatosis is a newly identified mycobacterium which is described to cause disseminated leprosy whose significance is still not clearly understood [10, 11]. *BI – Bacterial index, a semi-quantitative measure of bacterial load obtained by manual counting of bacilli per oil-immersion field. In summary, the following observations can be made concerning the pathology of leprosy: The author is indebted to Steve Keas and Angelina Deming for their expert preparation and staining of tissue sections and to Greg McCormick and Jerry Simmons for their invaluable assistance in assembling the figures. Many patients have multiple, recurrent episodes of T2R. The presence of an inflammatory infiltrate with a predominance of CD4+ T cells, differentiated macrophages and thickened epidermis have been observed in RR. The disease has been known to man since time immemorial. It manifests as numerous cutaneous nodules and plaques primarily over the back, buttocks, face, and bony prominences. Laryngeal involvement with stridor may be seen in very advanced cases and can lead to thickening of the mucosa (Figure 5D, 5E) and fatal laryngeal obstruction. Substantial evidence indicates that T1R are the result of the spontaneous enhancement of cellular immune responses to M. leprae, with increased numbers and percentages of CD4+ T-cells and the increased expression of genes for Th1 cytokines including IFN-γ and tumor necrosis factor α (TNF-α). (Fite/ Methylene blue, 1000×). The basis for this diversity has been recognized to be the differing capability of individuals to develop a cellular immune response to M. leprae [1]. Leprosy reactions are the acute episodes of clinical inflammation occurring during the chronic course of disease. Trauma to anesthetic limbs in any type of leprosy may result in ulceration and, without diligent care of early injuries, secondary infections may culminate in secondary osteomyelitis due to common Gram-positive or -negative organisms. Immunologically initiated inflammatory episodes, collectively termed “reactions” (see Chapter 2.2), affect approximately 40% of leprosy patients. Alter, A. Alcaïs, L. Abel, and E. Schurr, “Leprosy as a genetic model for susceptibility to common infectious diseases,”, A. Alcaïs, A. The maximum incubation period reported is as long as 30 years, or over, as observed among war veterans known to have been exposed for short periods in endemic areas but otherwise living in nonendemic areas. There are still only few reports about the role of B cells in active leprosy lesions in different spectral forms of the disease. Thus, when patients who have completed a full course of MDT present with new lesions, these are much more likely to be due to a leprosy reaction than to a relapse of infection, even if residual, dead bacilli are observed in the tissues. The pathogenesis of the Lucio reaction is not understood but the process appears to resemble a cutaneous infarct. Rarely, M. leprae may infect the iris [21]; however, the posterior compartment of the eye and the retina are not directly damaged by M. leprae. It may occur as a primary manifestation of the disease or in consequence to secondary drug resistance to dapsone following irregular and inadequate monotherapy. In lepromatous lesions, nerves may be highly infected, with a minimal inflammatory response (Figure 2). Both the hard and soft palates may be involved, sometimes leading to septal ulceration and perforation if not treated [8].

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