Figure 1(a)

Ear skin section of naturally infected animal. Observe a diffuse inflammatory cellular exudate in up dermis and focal around vessels, pylous and glands of deep dermis. HE 40×. B Ear skin section of naturally infected animal. Observe a diffuse inflammatory mononuclear exudate (arrows showing plasmocytes) in a dermis. HE 440×. C Nose skin section of naturally infected animal. Observe an intense inflammatory exudate of mononuclear cells in a dermis. HE 110×. D Nose skin section of naturally infected animal. Observe innumerous imunolabelled amastigotes forms of Leishmania. Streptoavidin-peroxidase method. 110×. E Ear skin section of symptomatic naturally infected animal. Intense inflammatory exudate can be observed. Note the absence of amastigotes forms of Leishmania HE 440×. F Ear skin section of asymptomatic naturally infected animal. Innumerous amastigotes of Leishmania can be observed. Note the absence of inflammatory exudate. HE 440×.