Featured Research

from universities, journals, and other organizations

Vibrio Bacteria Found In Norwegian Seafood And Seawater

Date:
February 24, 2009
Source:
Norwegian School of Veterinary Science
Summary:
Researchers have discovered potentially disease-causing vibrios (Vibrio cholerae, V. parahaemolyticus and V. vulnificus) in Norwegian seafood and inshore seawater.

Mixed culture of Vibrio species from a mussel sample
Credit: Anette Bauer Ellingsen

While working on her doctorate, Anette Bauer Ellingsen discovered potentially disease-causing vibrios (Vibrio cholerae, V. parahaemolyticus and V. vulnificus) in Norwegian seafood and inshore seawater.

Anette Bauer Ellingsen studied the occurrence of potentially pathogenic vibrios in Norway. These species include the cholera bacterium (V. cholerae) and the lesser-known species V. parahaemolyticus and V. vulnificus. All of these species may cause disease in people who eat raw or lightly-cooked seafood, and they can also cause extremely serious wound infection.

In Japan, V. parahaemolyticus is one of the most common causes of food poisoning, due to the Japanese predilection for sushi. In the USA, food poisoning caused by this bacterium is primarily associated with eating oysters.

Vibrio vulnificus is also associated with oyster eating, and this bacterium causes the greatest number of deaths from seafood poisoning in the USA.

That these bacteria also occur in Norway was previously unknown, and this is the first time that V. cholerae and V. vulnificus have been isolated from the Norwegian environment. All of the three vibrios were demonstrated in Norwegian mussels (at fewer than 100 bacteria /gram) and in Norwegian seawater (up to 30,000/litre) during the course of the study. They were first and foremost demonstrable when the water temperature rose above 20°C.

"Dangerous" and "not so dangerous" forms

It's important to emphasise that there can be big differences in pathogenicity within a species. Both V. cholerae and V. parahaemolyticus have their "dangerous" and "benign" variants, based on the toxins they produce. All V. vulnificus are assumed to be more or less equally dangerous, primarily in people with predisposing illnesses such as diabetes or hepatitis, and for people with weakened immunity.

Part of Anette Bauer Ellingsen's work was to investigate whether the "dangerous" variants of V. cholerae and V. parahaemolyticus occur in Norway. None of the cholera toxin-producing variants of V. cholerae were found among the Norwegian samples. However, it was discovered that some of the V. parahaemolyticus bacteria produce a toxin liable to cause diarrhoea.

The study showed that the danger of food poisoning posed by vibrios in Norwegian food products is extremely small. Nonetheless, toxin-producing V. parahaemolyticus was demonstrated, so one should be careful when eating raw or lightly-cooked seafood, for example, oysters.

Recreational activities and sore infection

In fact, the greatest risk of infection from vibrios is not food. There is possibly a greater chance of being infected in connection with recreational activities such as swimming or handling marine fish and shellfish in periods with high water temperature. All of the bacteria that were discovered during this study are liable to produce serious wound infection, especially in people with reduced immunity.

The study was carried out under the auspices of the Norwegian School of Veterinary Science, The Norwegian Food Safety Authority and the The Fishery and Aquaculture Industry Research Fund.

Anette Bauer Ellingsen B. Sc. (hons) defended her thesis, entitled " Vibrio parahaemolyticus, V. cholerae and V. vulnificus in Norway, with special attention to V. parahaemolyticus", on December 22, 2008, at the Norwegian School of Veterinary Science.


Story Source:

The above story is based on materials provided by Norwegian School of Veterinary Science. Note: Materials may be edited for content and length.


Cite This Page:

Norwegian School of Veterinary Science. "Vibrio Bacteria Found In Norwegian Seafood And Seawater." ScienceDaily. ScienceDaily, 24 February 2009. <www.sciencedaily.com/releases/2009/02/090224133505.htm>.
Norwegian School of Veterinary Science. (2009, February 24). Vibrio Bacteria Found In Norwegian Seafood And Seawater. ScienceDaily. Retrieved October 2, 2014 from www.sciencedaily.com/releases/2009/02/090224133505.htm
Norwegian School of Veterinary Science. "Vibrio Bacteria Found In Norwegian Seafood And Seawater." ScienceDaily. www.sciencedaily.com/releases/2009/02/090224133505.htm (accessed October 2, 2014).

Share This



More Plants & Animals News

Thursday, October 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Dolphins and Turtles Under Threat in Pakistan

Dolphins and Turtles Under Threat in Pakistan

AFP (Oct. 2, 2014) — The turtles and Dolphins of Pakistan's Indus river - both protected by law - are in a fight for their survival as man's activities threatens their futures. Duration: 02:29 Video provided by AFP
Powered by NewsLook.com
'Harvest Break' Endures in Maine Potato Fields

'Harvest Break' Endures in Maine Potato Fields

AP (Oct. 2, 2014) — Educators and farmers are clinging to a tradition aimed at giving farmers much-needed help in getting potatoes out of the fields and into storage before the ground freezes in the nation's northeast corner. (Oct. 2) Video provided by AP
Powered by NewsLook.com
Attacking Superbugs

Attacking Superbugs

Ivanhoe (Oct. 1, 2014) — Two weapons hospitals can use to attack superbugs. Scientists in Ireland created a new gel resistant to superbugs, and a robot that can disinfect a room in minutes. Video provided by Ivanhoe
Powered by NewsLook.com
Cultural Learning In Wild Chimps Observed For The First Time

Cultural Learning In Wild Chimps Observed For The First Time

Newsy (Oct. 1, 2014) — Cultural transmission — the passing of knowledge from one animal to another — has been caught on camera with chimps teaching other chimps. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins