ABSTRACT
Infectious and parasitic diseases have always challenged man. Although many of them are typically seen in some areas of the world and can be adequately managed by just improving socioeconomic status and sanitary conditions, they are still quite prevalent and may sometimes be seen outside their original geographical areas. Human migration due to different reasons, tourism, blood transfusion and solid organ transplantation has created new concerns for health professionals all over the world. If not for diagnostic purposes, at least these tropical and infectious diseases should be largely known because their epidemiology, pathogenesis, host/parasite interaction, inflammatory and reparative responses are quite interesting and teach us about human biology. Curiosity is inherent to pathology practice and so we are compelled to look for things other than tumours or degenerative diseases. This review focuses on infectious and parasitic diseases found in a developing country and brings up-to-date information on diseases caused by viruses (dengue, yellow fever), bacteria (typhoid fever, leprosy), parasites (Chagas' disease, cutaneous and visceral leishmaniasis, amoebiasis, Capillaria hepatica, schistosomiasis, cysticercosis) and caused by fungi (paracoccidioidomycosis, cryptococcosis, histoplasmosis) that may be useful for pathologists when facing somewhat strange cases from developing countries.
Subject(s)
Humans , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Parasitic Diseases/diagnosis , Parasitic Diseases/pathology , Bacterial Infections/diagnosis , Bacterial Infections/pathology , Brazil , Communicable Diseases/diagnosis , Communicable Diseases/pathology , Developing Countries , Mycoses/diagnosis , Mycoses/pathologyABSTRACT
We report the case of a 78-year-old male Brazilian farmer, who presented with an extensive ulcer on the right foot that had an erythematous and raised border. This ulcer involved most of the right plantar region and had persisted for more than 40 years. Satellite erythematous papules and tumor-like growths were also seen on the right ankle. Extracutaneous involvement was not found. Light microscopy showed epithelial hyperplasia and diffuse histiocyte infiltration with intense plasmocytosis. Cultures for fungi and Leishmania were negative. The polymerase chain reaction with specific primers for Leishmania was performed using DNA extracted from the lesions; it showed an amplification of 120 pB. The patient had an excellent response after two 20-day cycles of intra-venous N-methylglucamine antimonate (15 mg/Kg/day). Leishmaniasis should be highly considered in the differential diagnosis of chronic ulcers in endemic areas.
