2009, Number 3
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Rev Mex Patol Clin Med Lab 2009; 56 (3)
Chronic leptospirosis in Mexico: microscopic diagnosis and evidence supporting its existence and importance
Velasco-Castrejón O, Rivas-Sánchez B, Sánchez-Spíndola ME, Soriano J, Rivera-Reyes HH, Garibay SV
Language: Spanish
References: 35
Page: 157-167
PDF size: 143.18 Kb.
ABSTRACT
Chronic leptospirosis is a common clinical form but little-known and simulator of multiple diseases, which makes patients peregrinates from physician to physician and even tend to die without accurate diagnosis.
Material and methods: We studied 374 patients of both sexes, 1 to 86 years, clinically diagnosed with chronic leptospirosis for more than 6 months of evolution. Serology was performed by MAT. The leptospires were detected by dark field videorecording, silver impregnation and immunodetection in blood and urine. A 10 electron microscopy was performed in blood and in another 10, who died, the leptospires were searched in various organs by silver staining and immunodetection techniques.
Results: 75.7% of patients had low titers (‹ 1:80). Leptospires was observed in 85% and 89.9% by dark field videorecording, in 75% and 77% by silver staining and by 77% and 85% by immunodetection in blood and urine. Furthermore electron micrographs were obtained in 3 cases. Although 82% of cultures were early positive only we could get 3 strains. This strains were typify as
Leptospira Pomona. Furthermore leptospires were observed in 87% of the tissue of deceased individuals.
Discussion: These results, particularly those obtained by necropsy, ultramicroscopy and culture, associated with the long evolution of clinical, sometimes several years, confirm the existence of chronic leptospirosis and its importance as a cause of death. This report demonstrates too the high diagnostic value of dark field videorecording.
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