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Biomedical subjects

V A Neto

Publications and source records attributed to V A Neto.

14 recordsLinked to original sources

Immunodeficiency secondary to juvenile paracoccidioidomycosis: associated infections.

Four patients with acute paracoccidioidomycosis, hypoalbuminemia, ascites and associated infections are reported. They have been admitted to hospital 35 times, 4 of them due to active paracoccidioidomycosis, 14 to associated infections, 14 to ascites, edema and diarrhoea and 3 to herniorrhaphy. Two of them recovered after sepsis and central nervous system, muscular and subcutaneous cryptococcosis. The remaining two died. One had infectious diarrhoea (S. flexneri), peritoneal tuberculosis and sepsis (S. epidermidis); the other had bacterial meningitis, erysipelas, beta-hemolytic Streptococcus sepsis and miliary tuberculosis. Their immunodeficiency was attributed to enteric protein loss and/or malabsorption and malnutrition and was recognized by reduced response to delayed hypersensitivity skin tests in four patients and hypogammaglobulinemia in three of them. The authors discuss the need for prospective studies to be carried out, aiming at the mechanisms involved in secondary infections. Alternatives for maintaining the patients' adequate nutritional state should be investigated, to guarantee proper immune response and thus the ability to control intervening infections in patients with juvenile paracoccidioidomycosis.

Adolescent

Glomerular involvement in human kala-azar. A light, immunofluorescent, and electron microscopic study based on kidney biopsies.

Glomerular involvement characterized by mesangial cell proliferation with fibrillar thickening of the axial region and deposits of immune complexes is reported in three human cases of kala-azar. IgG was seen in all 3 and Igm in 2 patients. Complement (C3) was detected in the glomeruli in all cases and fibrinogen in the only case in which it was tested for. The deposits appeared mainly along the mesangium and their staining was particularly strong for complement and IgG. Electron microscopy detected granular electron dense deposits mainly close to mesangial cells. In one case clumps made us of electron dense lamellae were seen in the glomerular basal membrane interpreted as evidence of focal membranolysis. No granulocytes were seen in the glomeruli. Attempts to demonstrate antigen were unsuccessful. The pattern of the lesion resembles that described in the kidney of human cases of hepatosplenic schistosomiasis, and the distribution of the deposits suggests that relatively large, poorly soluble complexes formed either in the presence of excess antigen or, under certain circumstances, in the presence of excess antibody, are trapped in the glomerular capillaries. The aggregates are partially shunted to the mesangial cells, which enlarge and proliferate.

Adult