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 Climate change, population growth may lead to open ocean aquaculture
05.10.2017 | Oregon State University

nachricht New machine evaluates soybean at harvest for quality
04.10.2017 | University of Illinois College of Agricultural, Consumer and Environmental Sciences

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: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

Im Focus: New nanomaterial can extract hydrogen fuel from seawater

Hybrid material converts more sunlight and can weather seawater's harsh conditions

It's possible to produce hydrogen to power fuel cells by extracting the gas from seawater, but the electricity required to do it makes the process costly. UCF...

Im Focus: Small collisions make big impact on Mercury's thin atmosphere

Mercury, our smallest planetary neighbor, has very little to call an atmosphere, but it does have a strange weather pattern: morning micro-meteor showers.

Recent modeling along with previously published results from NASA's MESSENGER spacecraft -- short for Mercury Surface, Space Environment, Geochemistry and...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

Conference Week RRR2017 on Renewable Resources from Wet and Rewetted Peatlands

28.09.2017 | Event News

 
Latest News

A single photon reveals quantum entanglement of 16 million atoms

16.10.2017 | Physics and Astronomy

The melting ice makes the sea around Greenland less saline

16.10.2017 | Earth Sciences

On the generation of solar spicules and Alfvenic waves

16.10.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>