Relationship of Leishmania-specific IgG levels and IgG avidity with parasite density and clinical signs in canine leishmaniasis

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• 作者：Rafael Gonç ; alves Teixeira Neto ; Rodolfo Cordeiro Giunchetti ; Clá ; udia Martins Carneiro ; Ricardo Wagner de Almeida Vitor ; Wendel Coura-Vital ; Patrí ; cia Flá ; via Quaresma ; Henrique Gama
• 关键词：Canine visceral leishmaniasis ; Parasite burden ; Immunoglobulin avidity ; IgG profile
• 刊名：Veterinary Parasitology
• 出版年：2010
• 出版时间：11 May 2010
• 年：2010
• 卷：169
• 期：3-4
• 页码：248-257
• 全文大小：1000 K

文摘

The clinical status and tissue parasite burden of the skin and spleen of 40 dogs naturally infected with Leishmania chagasi (syn. Leishmania infantum), together with 5 uninfected control dogs, were assessed. On the basis of the clinical evaluation, infected dogs were classified as asymptomatic (AD) or symptomatic (SD). Infected animals were also grouped according to their parasite load as exhibiting low (LP), medium (MP) and high (HP) parasitism. The results indicated a high parasite load in the skin samples of SD animals in relation to the AD group. The serum immunoglobin isotype profiles of the studied animals revealed increased levels of IgG₁ in the AD and LP dogs, whereas high levels of IgG₂ were correlated with SD and HP dogs. The avidity index (AI) of IgG_total in the SD group was high in comparison of that of the AD group. Moreover, animals with a larger parasite burden either in the spleen or skin showed higher AI values than animals with lower parasitism. Based on these findings, it is suggested that CVL commences with an asymptomatic clinical form with low parasitism, high production of IgG₁ and low affinity of IgG_total molecules, and evolves into a symptomatic clinical form with higher parasitism intensity, higher IgG₂ levels, and high affinity of IgG_total.