Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Smart mathematical model prevents the spread of swine fever

11.04.2003


Dutch epidemiologists have calculated that partial vaccination can stop outbreaks of swine fever. What’’s more, mother sows do not need to be vaccinated. The research was carried out at the Institute for Animal Science and Health, Lelystad, and Utrecht University.

PhD student Don Klinkenberg calculated that partial vaccinations do not exceed the limit for the outbreak of an epidemic. If the mother sows are not vaccinated, the spread of the swine fever is limited to transfer to less than one pig production unit. Therefore a partial vaccination can successfully control an epidemic of swine fever.

An epidemic of swine fever is only possible if each pig production unit transfers the swine fever virus to an average of more than one other pig production unit. With complete vaccination the transfer of the virus remains under the limit and the epidemic eventually dies out. A disadvantage of complete vaccination is that the spread of the virus cannot be properly monitored. Virus-carrying piglets continue to be born and these form an infection danger for nearby breeding units. These piglets are scarcely detectable because the virus obtained form the mother sow does not respond to normal detection methods.



One possibility for rendering the piglets infected via the mother ’’visible’’, is not to vaccinate the mother sows. The piglets are then ’’normally’’ ill and can therefore be detected.

The researcher’’s conclusions are based on the mathematical model he developed. That model is valid for areas with an average pig density, relatively many breeding units and a virus of average virulence. The virus is comparable with that present during the epidemic of 1997 and 1998.

The model has calculated that the vaccination takes effect after about a week. Vaccination reduces the spread of the virus but does not completely prevent it. As a result of this the epidemic can still persist for several months. This will partly depend upon how severe the epidemic is when the vaccination takes place.

The question remains as to whether large-scale vaccination will take place in a future epidemic without the need for preventive slaughtering. Risks such as the transfer of the virus from sows to unborn piglets and the fact that the infection can never be completely excluded in vaccinated animals will probably be seen as too big for the further spread of the virus.

Nalinie Moerlie | alfa
Further information:
http://www.nwo.nl/news

More articles from Agricultural and Forestry Science:

nachricht Raiding the rape field
23.05.2018 | Julius-Maximilians-Universität Würzburg

nachricht New technique reveals details of forest fire recovery
17.05.2018 | DOE/Brookhaven National Laboratory

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Powerful IT security for the car of the future – research alliance develops new approaches

The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.

Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...

Im Focus: Molecular switch will facilitate the development of pioneering electro-optical devices

A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.

The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...

Im Focus: LZH showcases laser material processing of tomorrow at the LASYS 2018

At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.

At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...

Im Focus: Self-illuminating pixels for a new display generation

There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?

At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...

Im Focus: Explanation for puzzling quantum oscillations has been found

So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics

Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

In focus: Climate adapted plants

25.05.2018 | Event News

Save the date: Forum European Neuroscience – 07-11 July 2018 in Berlin, Germany

02.05.2018 | Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

 
Latest News

In focus: Climate adapted plants

25.05.2018 | Event News

Flow probes from the 3D printer

25.05.2018 | Machine Engineering

Less is more? Gene switch for healthy aging found

25.05.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>