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Related Experiment Video

Updated: Jun 3, 2026

Fabrication of Pulsatile Polymeric Microparticles Encapsulating Rabies Antigen
07:44

Fabrication of Pulsatile Polymeric Microparticles Encapsulating Rabies Antigen

Published on: May 12, 2023

Vaccine preparation by radiation processing.

Gabriela Craciun1, Diana Martin, Iulian Togoe

  • 1National Institute of Lasers, Plasma and Radiation Physics, Bucharest, Romania. gabriela.craciun@inflpr.ro

The Journal of Microwave Power and Electromagnetic Energy : a Publication of the International Microwave Power Institute
|March 10, 2011
PubMed
Summary

A novel radiation biotechnology using microwave (MW) and electron beam (EB) irradiation offers a new vaccine for ruminant infectious pododermatitis (IP). This innovative approach aims to improve protection against F. necrophorum bacteria, exceeding current efficacy rates.

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Area of Science:

  • Veterinary Microbiology
  • Radiation Biotechnology
  • Vaccine Development

Background:

  • Infectious pododermatitis (IP) in ruminants, caused by Fusobacterium necrophorum (F.n.), poses a significant challenge in livestock management.
  • Current vaccines for IP offer limited protection, with the best results achieving just over 60% efficacy.
  • There is a need for advanced biotechnological approaches to develop more effective prophylactic strategies.

Purpose of the Study:

  • To develop and evaluate a novel radiation biotechnology-based vaccine for the prevention of ruminant infectious pododermatitis.
  • To investigate the effects of microwave (MW) and electron beam (EB) irradiation on Fusobacterium necrophorum (F.n.) cultures and their exotoxins.
  • To compare the efficacy of vaccines produced using different irradiation methods and components.

Main Methods:

  • Two primary methods for vaccine preparation were employed: direct inactivation of F.n. exotoxins via MW/EB irradiation, and inactivation of isolated exotoxins using formalin after MW/EB irradiation of F.n. cultures.
  • F.n. cultures were subjected to MW and/or EB irradiation to assess effects on cell viability and exotoxin production.
  • Four vaccine types were prepared: A1 (whole irradiated cell culture), A2 (cell-free supernatant from irradiated culture), B1 (whole non-irradiated culture), and B2 (cell-free supernatant from non-irradiated culture).

Main Results:

  • Electron beam (EB) irradiation of F.n. cultures decreased cell viability while increasing exotoxin release compared to conventional methods.
  • Microwave (MW) irradiation reduced cell viability to zero but did not increase exotoxin levels; however, it could stimulate F.n. proliferation under specific conditions.
  • Vaccine candidates were prepared using irradiated and non-irradiated F.n. whole cells or culture supernatants for efficacy testing in affected ruminant farms.

Conclusions:

  • Radiation biotechnology, particularly using MW and EB irradiation, presents a promising avenue for developing enhanced vaccines against F.n.
  • The study introduces novel vaccine formulations with the potential to surpass the current 60% efficacy threshold for ruminant infectious pododermatitis prophylaxis.
  • Further testing is required to confirm the superior protection offered by these new radiation-derived vaccines in field conditions.