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10:47
Immuno-fluorescence Assay of Leptospiral Surface-exposed Proteins
Published on: July 1, 2011
IMMUNOLOGY OF THE PERUVIAN STRAINS OF LEPTOSPIRA ICTEROIDES
1Laboratories of The Rockefeller Institute for Medical Research.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Serum from yellow fever patients neutralized Leptospira icteroides, demonstrating its protective effect in guinea pigs. Early administration of this anti-icteroides serum was crucial for preventing severe disease and death.
Area of Science:
- * Infectious Diseases
- * Bacteriology
- * Immunology
Background:
- * Yellow fever convalescent serum exhibits neutralizing antibodies against Leptospira icteroides.
- * Leptospira icteroides strains from Guayaquil and Merida show similar virulence.
- * Native Payta guinea pigs display higher resistance to Leptospira icteroides infection.
Purpose of the Study:
- * To evaluate the efficacy of serum from yellow fever convalescents in neutralizing Leptospira icteroides.
- * To determine the protective and therapeutic potential of anti-icteroides serum in a guinea pig model.
- * To assess the virulence of different Leptospira icteroides strains.
Main Methods:
- * Pfeiffer reaction assays using serum from yellow fever convalescents and Leptospira icteroides strains.
- * In vivo protection and treatment experiments in guinea pigs inoculated with Leptospira icteroides.
- * Virulence testing to determine minimum lethal doses of Leptospira icteroides.
Main Results:
- * Convalescent serum demonstrated positive Pfeiffer reactions and protected guinea pigs against Leptospira icteroides.
- * The effectiveness of the serum varied with the time of administration, with earlier treatment yielding better outcomes.
- * Significant protection was observed even when serum was administered after jaundice onset, though in larger doses.
Conclusions:
- * Yellow fever convalescent serum contains antibodies effective against Leptospira icteroides.
- * Anti-icteroides serum holds therapeutic potential for leptospirosis, particularly when administered early.
- * Fresh rabbit serum is recommended for optimal Leptospira icteroides culture.
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