Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Snail fever expected to decline in Africa due to climate change

13.12.2013
Research The dangerous parasite Schistosoma mansoni that causes snail fever in humans could become significantly less common in the future a new international study led by researchers from the University of Copenhagen predicts.
The results are surprising because they contradict the general assumption that climate change leads to greater geographical spread of diseases. The explanation is that the parasite’s host snails stand to lose suitable habitat due to climate change.

“Our research shows that the expected effects of climate change will lead to a reduction in suitable habitats for four out of five species of host snails for the parasite. According to our models, several areas will become too hot for the snails in the future and new precipitation patterns will affect the freshwater areas where they live”, says postdoc Anna -Sofie Stensgaard from the Danish National Research Foundation Center for Macroecology, Evolution and Climate at the University of Copenhagen.

Several of the freshwater snails acting as intermediate host for the schistosomiasis parasite, are predicted to have fewer climatically suitable habitat areas in the future. Photo: Henry Madsen, Department of Veterinary Disease Biology.

Schistosomiasis is an infectious disease caused by parasitic flatworms of the genus Schistosoma.

They infect humans by penetrating the skin when in contact with water. They spread in freshwater areas such as rivers and lakes where fresh water snails act as intermediate host for the parasite's larvae.

Therefore, the snails’ habitats are of great importance for the spread of the disease.

Up to 19 % reduction in infectious areas

The researchers modeled the changes in snail habitat from today to 2080 under various climate change scenarios, and what that will mean for the spread of the parasite. The forecasts show up to 19 % reduction in the total geographical area of infection risk in Africa, as the geographical distribution of the main host snail will be reduced significantly.

“Our results are consistent with the scientific view that climate change leads to lower biodiversity, but not that climate change necessarily leads to a greater spread of diseases”, Anna -Sofie Stensgaard explains about the study that has just been published in the scientific journal Acta Tropica.

New areas at risk

Even though the overall infection is predicted to decline in Africa, the study also identifies some areas where the disease could spread. Senior researcher Thomas Kristensen from the Department of Veterinary Disease Biology explains:

“Our models are not designed to pinpoint changes on a local scale but they provide an overall picture of a decline in areas suitable for the parasite in West and Central Africa, while it may be able to establish itself in new areas especially in Africa's southern regions.”

In addition, climate change will affect the host snails differently and one of the studied species actually stands to benefit from the changes. The study underlines that it is essential to include biological knowledge of different host species in the models to gain robust future scenarios for the spread of diseases.

Climate is not everything

The research also shows, however, that climate is not necessarily the most important factor for the spread of diseases such as snail fever. Natural and human-induced changes of the snails’ habitats, which are difficult to predict, may also play a very important role.

Humans are infected with schistosomiasis in freshwater areas like these, where freshwater snails act as intermediate hosts for the parasite. Photo Henry Madsen, Department of Veterinary Disease Biology. Download free press photo.

“Over results highlights that especially anthropogenic environmental change - in combination with climatic factors - is crucial for the present distribution of host snails in Africa”, concludes Anna -Sofie Stensgaard.

This is consistent with other studies showing that man-made changes in the environment such as the damming of rivers, irrigation of fields and construction of large water reservoirs can create new habitats for the snails, which could in turn increase the risk of infection.

The research was conducted in collaboration with researchers from Switzerland, Zambia, Uganda and Cameroon.

Contact

Post doc Anna -Sofie Stensgaard, mobile: +45 26297650
Senior researcher Thomas Kristensen, mobile: +45 40503674
Communications officer Elisabeth Wulffeld, mobile: +45 21179140

Anna-Sofie Stensgaard | EurekAlert!
Further information:
http://www.ku.dk

More articles from Health and Medicine:

nachricht Millions through license revenues
27.04.2017 | Rheinische Friedrich-Wilhelms-Universität Bonn

nachricht New High-Performance Center Translational Medical Engineering
26.04.2017 | Fraunhofer ITEM

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

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

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Fighting drug resistant tuberculosis – InfectoGnostics meets MYCO-NET² partners in Peru

28.04.2017 | Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

 
Latest News

Wireless power can drive tiny electronic devices in the GI tract

28.04.2017 | Medical Engineering

Ice cave in Transylvania yields window into region's past

28.04.2017 | Earth Sciences

Nose2Brain – Better Therapy for Multiple Sclerosis

28.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>