The Leptospira interrogans vaccines currently available are serovar specific and require regular booster immunizations to maintain protection of the host. In addition, a hamster challenge batch potency test is necessary to evaluate these vaccines prior to market release, requiring the use of a large number of animals, which is ethically and financially undesirable. Our previous work showed that the N terminus of the outer membrane protein LipL32 was altered in Leptospira interrogans serovar Canicola vaccines that fail the hamster challenge test, suggesting that it may be involved in the protective immune response. The aim of this study was to determine if vaccination with LipL32 protein alone could provide a protective response against challenge with L. interrogans serovar Canicola to hamsters. Recombinant LipL32, purified from an Escherichia coli expression system, was assessed for protective immunity in five groups of hamsters (n = 5) following a challenge with the virulent L. interrogans serovar Canicola strain Kito as a challenge strain. However, no significant survival against the L. interrogans serovar Canicola challenge was observed compared to that of unvaccinated negative controls. Subsequent histological analysis revealed reduced amounts of L. interrogans in the kidneys from the hamsters vaccinated with recombinant LipL32 protein prior to challenge; however, no significant survival against the L. interrogans serovar Canicola challenge was observed compared to that of unvaccinated negative controls. This finding corresponded to a noticeably reduced severity of renal lesions. This study provides evidence that LipL32 is involved in the protective response against L. interrogans serovar Canicola in hamsters and is the first reported link to LipL32-induced protection against kidney invasion.
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http://dx.doi.org/10.1128/CVI.00719-13 | DOI Listing |
Mikrobiyol Bul
January 2025
Sağlık Bilimleri Üniversitesi, Samsun Eğitim ve Araştırma Hastanesi, Enfeksiyon Hastalıkları ve Klinik Mikrobiyoloji Anabilim Dalı, Samsun.
Leptospiroz, insan ve hayvanları etkileyen, Antarktika hariç tüm kıtalarda bulunan ve Leptospira cinsi spiroketlerin neden olduğu zoonotik bir enfeksiyon hastalığıdır. Salgınlara yol açabilmesi nedeniyle halk sağlığı açısından önemli bir hastalıktır. Bu çalışmada; kliniğimizde leptospiroz tanısıyla izlenen 11 olgunun, epidemiyolojik özellikleri, saptanan etkenler, klinik ve laboratuvar bulguları açısından retrospektif olarak değerlendirilmesi amaçlanmıştır.
View Article and Find Full Text PDFHeliyon
January 2025
Bacterial Disease Laboratory, Postgraduate Program in Animal Science in Tropics - Federal University of Bahia, Salvador, Bahia, Brazil.
Leptospirosis is a zoonotic infectious disease that significantly impacts animal and public health. Comparative genomics can aid in understanding poorly understood aspects of leptospirosis pathogenesis, including infection mechanisms, antimicrobial resistance, and host interactions across different epidemiological scenarios. This study aimed to compare the genomes of serogroup Icterohaemorrhagiae strains isolated from three host species in a single epidemiological scenario.
View Article and Find Full Text PDFVet World
November 2024
School of Veterinary Medicine, National University of Loja (UNL), Loja 1101608, Ecuador.
Background And Aim: Leptospirosis is an infectious zoonotic disease that significantly affects animal health, particularly the reproduction of ruminants. However, some aspects of epidemiology and clinical characteristics have not been clarified. This study aimed to estimate the prevalence and identify risk factors of leptospirosis in female bovines at reproductive age in the Ecuadorian Amazon rainforest.
View Article and Find Full Text PDFActa Med Philipp
December 2024
Department of Biochemistry and Molecular Biology, College of Medicine, University of the Philippines Manila.
Background And Objective: Leptospirosis is a disease caused by pathogenic prevalent in tropical countries like the Philippines. Some studies have shown that the role of currently used antibiotics for leptospirosis is unclear since trials have found no significant benefit to patient outcomes compared to placebo. This signals the need for alternative therapies, such as herbal medicines, which may provide effective therapeutic regimens in treating this infection.
View Article and Find Full Text PDFZoonoses Public Health
January 2025
CHUV, Oniris, Nantes, France.
Background: Leptospirosis is a widespread zoonosis caused by bacteria in the genus Leptospira. Basic epidemiological information is crucial to mitigating disease risk but is lacking for leptospirosis; notably, the hosts responsible for maintaining Leptospira remain largely unknown. Frequently observed near human habitations, hedgehogs (Erinaceus europaeus) are taken to wildlife rescue centres when found sick or injured.
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