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Rev1Δwzm vaccine candidate is safe in young and adult sheep and protects against Brucella ovis infection in rams. | LitMetric

Rev1Δwzm vaccine candidate is safe in young and adult sheep and protects against Brucella ovis infection in rams.

Vaccine

Instituto de Agrobiotecnología (IdAB; CSIC-Gobierno de Navarra), Avda. Pamplona 123, 31192 Mutilva, Navarra, Spain. Electronic address:

Published: September 2024

AI Article Synopsis

Article Abstract

Small ruminants affected by brucellosis, caused mainly by Brucella melitensis and B. ovis, suffer reproductive disorders, leading to significant economic losses worldwide. Vaccination is an essential tool to prevent the disease in ovine and caprine livestock, but the only vaccine recommended to date is B. melitensis Rev1, which in sheep is only safe for use in lambs aged 3-4 months. This restriction poses considerable practical challenges for the implementation of Rev1 in countries with endemic brucellosis and/or limited resources, where there is a need for mass vaccination with a safe vaccine to control the disease in both animals and humans. We recently developed a B. melitensis strain Rev1Δwzm showing superior vaccine properties in mice and safety in pregnant ewes. Here, we report that Rev1Δwzm (i) is safe in young and adult sheep, both male and female; (ii) induces a transient serological response in the Rose Bengal test in ≤50 % of sheep, confirmed to some extent by the complement fixation test, and a stronger, more persistent anti- rough-LPS response; and (iii) protects rams against a B. ovis challenge 25 weeks after vaccination. To resolve the problem of serological interference, the use of green fluorescent protein tagging strategy allowed us to identify vaccinated sheep with only a single inoculation. These results, together with the previously reported safety in pregnant ewes, position Rev1Δwzm as a firm vaccine candidate and a promising alternative to Rev1. Further experiments are warranted to assess its efficacy against B. melitensis in pregnant ewes.

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Source
http://dx.doi.org/10.1016/j.vaccine.2024.05.046DOI Listing

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