Featured Research

from universities, journals, and other organizations

Borrelia infection in ticks in Norway

Date:
June 24, 2011
Source:
Norwegian School of Veterinary Science
Summary:
The most common tick-borne disease in humans is Lyme borreliosis. Extensive field and laboratory tests have revealed that the Borrelia bacterium is present in a larger proportion of ticks than has been shown by earlier studies. Another finding is that migratory birds play an important role in the spreading of ticks and pathogenic agents borne by ticks.

Female tick with eggs.
Credit: Vivian Kjelland

The most common tick-borne disease in humans is Lyme borreliosis. Extensive field and laboratory tests have revealed that the Borrelia bacterium is present in a larger proportion of ticks than has been shown by earlier studies. Another finding is that migratory birds play an important role in the spreading of ticks and pathogenic agents borne by ticks.

Ticks are to be found in most parts of the world, and more than 900 species have been identified so far. The geographic distribution of these many tick species varies and the most prevalent species in Norway is the forest tick (Ixodes ricinus), which can be the bearer of a number of bacteria and viruses that can infect animals and humans and cause disease.

In recent years, there has been increasing focus on ticks and the diseases a tick bite can cause and there are also indications that ticks are occurring in new areas of the country. This has resulted in an increase in the number of disease cases, both as regards Lyme borreliosis (LB) and other illnesses such as tick-borne encephalitis (TBE).

As part of her doctoral research at The Norwegian School of Veterinary Science, Vivian Kjelland has carried out extensive field and laboratory studies with a view to increasing our knowledge in this field. She has examined the occurrence of Borrelia burgdorferi sensu lato (s.l.) in ticks and which genotypes of the bacterium occur in ticks in Norway. Her results show that a larger proportion of the ticks were infected, compared to the findings of earlier Norwegian and Scandinavian studies.

Migratory birds are thought to be an important factor in the global spreading of ticks and tick-borne pathogens. Some of Kjelland's work involved collecting ticks from migratory birds in order to study them. Ticks from 6538 migratory birds caught at Lista Ornithological Station were analysed to find out whether they were infected by Borrelia. Kjelland's study corroborates the assumption that birds play an important role in the spreading of ticks and that they may be partly responsible for the prevalence of various genotypes of B. burgdorferi s.l. in Europe.

The hare population seems to be in strong decline in Norway. The results of Kjelland's doctoral research indicate that a Borrelia infection spread from the bite to the bloodstream or internal organs seldom occurs in hares and that the bacterium probably does not play a significant role in the decline of the hare population. But Kjelland's findings show that hares can be reservoirs for certain genotypes of the bacterium.

The role played by deer in the ecology of Lyme borreliosis is a subject of debate. Kjelland's doctoral thesis indicates that there is a lower incidence of the Borrelia bacterium in ticks that have sucked blood from deer and moose than in ticks collected from the ground/vegetation.


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. "Borrelia infection in ticks in Norway." ScienceDaily. ScienceDaily, 24 June 2011. <www.sciencedaily.com/releases/2011/06/110624083512.htm>.
Norwegian School of Veterinary Science. (2011, June 24). Borrelia infection in ticks in Norway. ScienceDaily. Retrieved September 20, 2014 from www.sciencedaily.com/releases/2011/06/110624083512.htm
Norwegian School of Veterinary Science. "Borrelia infection in ticks in Norway." ScienceDaily. www.sciencedaily.com/releases/2011/06/110624083512.htm (accessed September 20, 2014).

Share This



More Health & Medicine News

Saturday, September 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Sierra Leone's Nationwide Ebola Curfew Underway

Sierra Leone's Nationwide Ebola Curfew Underway

Newsy (Sep. 20, 2014) Sierra Leone is locked down as aid workers and volunteers look for new cases of Ebola. Video provided by Newsy
Powered by NewsLook.com
Changes Found In Brain After One Dose Of Antidepressants

Changes Found In Brain After One Dose Of Antidepressants

Newsy (Sep. 19, 2014) A study suggest antidepressants can kick in much sooner than previously thought. Video provided by Newsy
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Jury Delivers Verdict in Salmonella Trial

Jury Delivers Verdict in Salmonella Trial

AP (Sep. 19, 2014) A federal jury has convicted three people in connection with an outbreak of salmonella poisoning five years ago that sickened hundreds of people and was linked to a number of deaths. (Sept. 19) Video provided by AP
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:
from the past week

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