Carp edema virus, also known as koi sleepy disease (CEV/KSD), is a special form of sleepy disease affecting koi and common carp. Long known only in Japan, the disease was recently detected in Europe. An infection with the virus causes lethargic and sleepy behaviour in the fish. In up to 80 percent of the cases, the infection is fatal. Researchers at the Vetmeduni Vienna, recently identified the disease in Austria, publishing their results in the journal Transboundary and Emerging Diseases.
CEV/KSD is an infectious disease that was first reported in Japan in the 1970s. Infected fish typically lie at the bottom of the ponds exhibiting extreme apathy. Typical symptoms include sunken eyes, dermatological changes and swollen gills. Serious cases of the disease affect the gill tissue to such a degree that it also impedes oxygen delivery.
Virus spreads across in Europe
The disease has since been detected in koi in Germany, France, the Netherlands and other European countries. In England the virus was also found common carp. Diagnostic work by Eva Lewisch and her colleagues at the Clinical Division of Fish Medicine at the University of Veterinary Medicine, Vienna, has now also revealed the disease among koi and common carp in Austria.
“Initially we were unable to find a cause for the serious illness in the carps using routine diagnostic tests. Molecular detection revealed that we were looking at an infection caused by the koi sleepy disease virus,” says Lewisch.
“The pathogen most likely originates from Asia, where the disease has been known for a long time. Which type of pathogen we are dealing with is not completely clear yet. Electron microscopy indicates that the carp edema virus could be a smallpox-like virus”, says Lewisch.
Koi sleepy disease present in Austria for longer than believed
An analysis of archived genetic material revealed that koi sleepy disease has been present in Austria since at least 2010.
“Every spring, we observe an increased mortality of carp. Koi sleepy disease very likely is playing a role,” Lewisch believes.
Water temperature and stress a factors
Lewisch believes that the infection could be widespread among koi and carp stock. Outbreaks are caused by environmental factors such as water temperature and stress conditions. In Europe, carp live in water with temperatures ranging between 7 and 15°C. In Japan, the typical water temperature of koi ponds is between 15 and 25°C. European carp apparently fall ill at lower temperatures than koi in Asia. “We must consider the possibility that the virus has mutated and that it has adapted to European conditions,” says Lewisch.
Great international interest
“Up until a few years ago, almost nothing was known about the spread of the disease in Europe. There were only scattered reports from national veterinary news sources,” Lewisch says. This September, a workshop on the subject of KSD/CEV is planned at the conference of the European Association of Fish Pathologists (EAFP). Experts from all over Europe will discuss the latest developments and debate possible measures for an international fight against the disease.
Global koi trade promotes spread of virus
“The global koi trade poses a real danger for the spread of viral infections and other diseases,” Lewisch points out. “Introduced infections can represent a threat for local stock of common carp. One such example is the koi herpes virus (KHV). This notifiable disease, the presence of which has been documented since the 1990s, causes immense economic damage to stock of common carp all over the world.”
The article „Carp Edema Virus/Koi Sleepy Disease: An Emerging Disease in Central-East Europe“ by E. Lewisch, B. Gorgoglione, K. Way und M. El-Matbouli was published in Transboundary and Emerging Diseases. DOI: 10.1111/tbed.12293
About the University of Veterinary Medicine, Vienna
The University of Veterinary Medicine, Vienna in Austria is one of the leading academic and research institutions in the field of Veterinary Sciences in Europe. About 1,300 employees and 2,300 students work on the campus in the north of Vienna which also houses five university clinics and various research sites. Outside of Vienna the university operates Teaching and Research Farms. http://www.vetmeduni.ac.at
Dr. Eva Lewisch
Clinical Unit of Fish Medicine
University of Veterinary Medicine Vienna (Vetmeduni Vienna)
T +43 1 25077-4700
Science Communication / Public Relations
University of Veterinary Medicine Vienna (Vetmeduni Vienna)
T +43 1 25077-1153
Dr. Susanna Kautschitsch | idw - Informationsdienst Wissenschaft
More genes are active in high-performance maize
19.01.2018 | Rheinische Friedrich-Wilhelms-Universität Bonn
How plants see light
19.01.2018 | Albert-Ludwigs-Universität Freiburg im Breisgau
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy