Two bivalent leptospiral bacterins were compared for safety in guinea pigs and for potency in hamsters. One bacterin (Bacterin A) was prepared from the cellular material of Leptospiral icterohaemorrhagiae and Leptospira canicola cultures propagated in Stuart's modified medium with 7% rabbit serum. The 2nd bacterin (Bacterin B) contained whole leptospiral cultures grown in synthetic medium. Neither bacterin induced adverse local or systemic reactions when injected intraperitoneally (I/P) in guinea pigs. In hamsters, 1/400 and 1/800 of the recommended dose of bacterin B for cattle protected 100% of the vaccinated hamsters against challenge exposure of either virulent leptospiral serotype. A dose representing 1/400 of the recommended dose of bacterin A for cattle protected 80% of vaccinated hamsters against challenge exposure to L. icterohaemorrhagiae and 90% against challenge exposure to L. canicola, whereas the 1/800 dose level protected only 10% of the vaccinated hamsters challenge exposed to virulent culture of L. icterohaemorrhagiae or canicola. The possibility was demonstrated that at least one soluble antigen of strong immunogenic properties is produced in cultures of L. icterohaemorrhagiae and L. canicola.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
Development of nebulized inhalation delivery for fusion-inhibitory lipopeptides to protect non-human primates against Nipah-Bangladesh infection.
Antiviral Res
January 2025
CIRI, Centre International de Recherche en Infectiologie, INSERM U1111, CNRS, UMR5308, Univ Lyon, Université Claude Bernard Lyon 1, École Normale Supérieure de Lyon, 21 Avenue Tony Garnier, 69007 Lyon, France.
Nipah virus (NiV) is a lethal zoonotic paramyxovirus that can be transmitted from person to person through the respiratory route. There are currently no licensed vaccines or therapeutics. A lipopeptide-based fusion inhibitor was developed and previously evaluated for efficacy against the NiV-Malaysia strain.
View Article and Find Full Text PDFAnimal Models of Non-Respiratory, Post-Acute Sequelae of COVID-19.
Viruses
January 2025
Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA.
Post-acute sequelae of COVID-19 (PASC) are a diverse set of symptoms and syndromes driven by dysfunction of multiple organ systems that can persist for years and negatively impact the quality of life for millions of individuals. We currently lack specific therapeutics for patients with PASC, due in part to an incomplete understanding of its pathogenesis, especially for non-pulmonary sequelae. Here, we discuss three animal models that have been utilized to investigate PASC: non-human primates (NHPs), hamsters, and mice.
View Article and Find Full Text PDFA Review of the Utility of Established Cell Lines for Isolation and Propagation of the Southern African Territories Serotypes of Foot-and-Mouth Disease Virus.
Viruses
December 2024
Department of Biological Sciences and Biotechnology, School of Life Sciences, Botswana International University of Science and Technology, Private Bag 16, Palapye 10071, Botswana.
Cell culture underpins virus isolation and virus neutralisation tests, which are both gold-standard diagnostic methods for foot-and-mouth disease (FMD). Cell culture is also crucial for the propagation of inactivated foot-and-mouth disease virus (FMDV) vaccines. Both primary cells and cell lines are utilised in FMDV isolation and propagation.
View Article and Find Full Text PDFDevelopment and characterization of a reverse genetics system for the lineage II Chicava strain of Machupo virus in a guinea pig model.
PLoS Negl Trop Dis
January 2025
Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas, United States of America.
Background: Machupo virus (MACV) is a New World mammarenavirus (hereafter referred to as "arenavirus") and the etiologic agent of Bolivian hemorrhagic fever (BHF). No vaccine or antiviral therapy exists for BHF, which causes up to 35% mortality in humans. New World arenaviruses evolve separately in different locations.
View Article and Find Full Text PDFA Spike-Based mRNA Vaccine Encapsulated in Phospholipid 1,2-Dioleoyl-sn-Glycero-3-PhosphoEthanolamine Containing Lipid Nanoparticles Induced Potent B- and T-Cell Responses Associated with Protection Against SARS-CoV-2 Infection and COVID-19-like Symptoms in Hamsters.
Vaccines (Basel)
January 2025
Laboratory of Cellular and Molecular Immunology, Gavin Herbert Eye Institute, School of Medicine, University of California Irvine, Irvine, CA 92697, USA.
Background: Nucleoside-modified mRNA encapsulated in lipid nanoparticles (LNPs) have emerged as a promising vaccine strategy, especially for COVID-19. While the LNPs protect mRNA from degradation and efficiently deliver the mRNA to antigen-presenting cells, the effect of lipid composition on the immunogenicity and protective efficacy of mRNA/LNP vaccines is not well characterized. Studies on using the mRNA/LNP platform for vaccines have largely focused on the nucleic acid cargo with less attention paid to the LNP vehicle.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!