Navigation Links
Wild sheep show benefits of putting up with parasites
Date:8/7/2014

In the first evidence that natural selection favors an individual's infection tolerance, researchers from Princeton University and the University of Edinburgh have found that an animal's ability to endure an internal parasite strongly influences its reproductive success. Reported in the journal PLoS Biology, the finding could provide the groundwork for boosting the resilience of humans and livestock to infection.

The researchers used 25 years of data on a population of wild sheep living on an island in northwest Scotland to assess the evolutionary importance of infection tolerance. They first examined the relationship between each sheep's body weight and its level of infection with nematodes, tiny parasitic worms that thrive in the gastrointestinal tract of sheep. The level of infection was determined by the number of nematode eggs per gram of the animal's feces.

While all of the animals lost weight as a result of nematode infection, the degree of weight loss varied widely: an adult female sheep with the maximum egg count of 2,000 eggs per gram of feces might lose as little as 2 percent or as much as 20 percent of her body weight. The researchers then tracked the number of offspring produced by each of nearly 2,500 sheep and found that sheep with the highest tolerance to nematode infection produced the most offspring, while sheep with lower parasite tolerance left fewer descendants.

To measure individual differences in parasite tolerance, the researchers used statistical methods that could be extended to studies of disease epidemiology in humans, said senior author Andrea Graham, an assistant professor of ecology and evolutionary biology at Princeton. Medical researchers have long understood that people with similar levels of parasite infection can experience very different symptoms. But biologists are just beginning to appreciate the evolutionary importance of this individual variation.

"For a long time, people assum
'/>"/>

Contact: Morgan Kelly
mgnkelly@princeton.edu
609-258-5729
Princeton University
Source:Eurekalert  

Page: 1 2 3 4

Related medicine news :

1. Karras Farm Inc. Announces that the First Baby Awassi Sheep to Be Born in the United States has Arrived
2. Tactical Response Unleashed (TRU) Launches Its New Series of Sheepdog Warrior Classes at 50% Off
3. Talking to Yourself Could Have Mental Benefits
4. Research examines when benefits of screening mammography outweigh the harms for women in their 40s
5. Everyday fish oil capsule may provide kidney-related benefits
6. Back Pain Therapy Often Yields Early Benefits: Study
7. Benefits of Widespread Statin Use Outweigh Risks: Study
8. Accelerated chemotherapy given before surgery benefits patients with muscle-invasive bladder cancer
9. Experts call for clinical trials to test non-skeletal benefits of vitamin D
10. Flu shot during pregnancy shows unexpected benefits in large study
11. Zane Benefits Announces Wellness HRAs: A New Way to Reward Healthy Employees
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Wild sheep show benefits of putting up with parasites
(Date:9/30/2014)... no genetic evidence that high levels of vitamin D ... Some previous research had suggested that elevated levels ... diabetes, raising the possibility of a link between vitamin ... this study, British researchers investigated the association between diabetes ... control blood levels of vitamin D. They found no ...
(Date:9/30/2014)... 2014 (HealthDay News) -- Children conceived either less than one ... a sibling could be at increased risk for autism, a ... and an outside expert agree that the research can,t prove ... "Most importantly, it is important that parents understand that the ... are close together or far apart," said outside expert Dr. ...
(Date:9/30/2014)... to cut climate-changing carbon emissions will reduce other ... benefits, according to a new study released today. ... options included in the final Clean Power Plan, ... premature deaths and hospitalizations, and hundreds of heart ... the new study, Health Co-benefits of Carbon Standards ...
(Date:9/30/2014)... By Alan Mozes ... 2014 (HealthDay News) -- Colon cancer patients who are ... slightly higher risk for developing a second weight-related cancer, ... to the risk of colon cancer recurrence, only the ... , "We found that colorectal cancer survivors who reported ...
(Date:9/30/2014)... lung cancer, breast cancer is the leading cause of ... Society. That,s why so many medical professionals encourage women ... at best: only a minority of suspicious mammograms actually ... lots of needless worry for women and their familiesnot ... tests, including ultrasounds and biopsies. , Recently, a ...
Breaking Medicine News(10 mins):Health News:Gene Study Finds No Proof Vitamin D Guards Against Type 2 Diabetes 2Health News:Spacing Between Sibling Births Tied to Autism Risk in Study 2Health News:Power plant standards could save thousands of US lives every year 2Health News:Power plant standards could save thousands of US lives every year 3Health News:Obesity Tied to Higher Cancer Risk for Colon Cancer Survivors 2Health News:Obesity Tied to Higher Cancer Risk for Colon Cancer Survivors 3Health News:'Virtual breast' could improve cancer detection 2
... BOZEMAN, Mont. -- West Nile virus is apparently here to ... entomologist Greg Johnson. , Urging Montanans to protect themselves with ... sure to emerge when temperatures reach the 70s and 80s. ... as they were in 2003 and 2007, but Montanans should ...
... brain, study reports , , WEDNESDAY, June 11 (HealthDay ... risk of experiencing a stroke in which there is bleeding ... , Researchers, reviewing the medical records of almost 30,000 people ... ran nearly twice the risk of a subarachnoid hemorrhage than ...
... Researchers from the Case Western Reserve University School of ... a novel therapeutic that reduces sterile inflammation within the ... Journal of Leukocyte Biology, Dr. Eric Pearlman and ... compound that when delivered in nano-sized packages reduces corneal ...
... Efficiency in Health Care has assessed recent evidence on allergies. ... symptoms can definitely help many people with allergies. , When ... season has hit its peak. And the number of people ... in get hayfever, and up to half of the population ...
... be quizzed about their children,s sex education in a unique ... taught to deaf pupils. , The University of Manchester,s Audiology ... hearing primary school children for its research on children,s sex ... will make SRE more accessible for deaf children and, at ...
... NEW YORK, June 11 WallSt.net,s 3-Minute Press Show ... Tolentino., Shows air Monday through Friday on: ... interviews with,public company executives on their company and most ... with insight into a company,s most,recent press release, and ...
Cached Medicine News:Health News:Wet or dry, Montana still threatened by West Nile 2Health News:Women, Mexican Americans at Higher Risk for Certain Stroke 2Health News:Latest research on allergies: Specific immunotherapy can help 2Health News:Study aims to improve sex education for deaf pupils 2Health News:Study aims to improve sex education for deaf pupils 3Health News:[video] WallSt.net's '3 Minute Press Show' Features Executive Interviews and Highlights Recent Press for the Following: IUSA, IFUE, FEED, RXEI, GMPM, CRCUF, CVSC, GNMT 2Health News:[video] WallSt.net's '3 Minute Press Show' Features Executive Interviews and Highlights Recent Press for the Following: IUSA, IFUE, FEED, RXEI, GMPM, CRCUF, CVSC, GNMT 3
(Date:9/30/2014)... ATLANTA , Sept. 30, 2014  Georgia-Pacific ... systems, towels and tissue for a wide range ... success of its product lines in healthcare, including ... practices, Georgia-Pacific Professional is introducing its healthcare products ... "Georgia-Pacific Professional understands the importance of infection control ...
(Date:9/30/2014)... 30, 2014   Decision Resources Group finds ... anemic chronic kidney disease non-dialysis (CKD-ND) patients are ... medication. In addition, one-year persistency is similar between ... Other key findings from the report entitled ... Erythropoiesis Stimulating Agents in Late Stage Chronic Kidney ...
(Date:9/30/2014)... , Sept. 30, 2014   Acutus ... minimally invasive real-time 3D Cardiac Chamber Imaging and Dipole ... and / or sustain complex cardiac arrhythmias, including atrial ... to continue developing its imaging/mapping system as well as ... will allow Acutus Medical to complete work on the ...
Breaking Medicine Technology:Georgia-Pacific Professional Brings Its Success in Medical Solutions to the Dental Community 2Georgia-Pacific Professional Brings Its Success in Medical Solutions to the Dental Community 3Persistency is Low for Late-Stage Anemic CKD Non-Dialysis Patients Treated with Erythropoiesis-Stimulating Agents 2Persistency is Low for Late-Stage Anemic CKD Non-Dialysis Patients Treated with Erythropoiesis-Stimulating Agents 3Acutus Medical, Inc. Completes Additional $26.2M Series B Financing to Fund Portfolio Expansion 2Acutus Medical, Inc. Completes Additional $26.2M Series B Financing to Fund Portfolio Expansion 3
... NEW YORK, Oct. 7 Reportlinker.com announces that ... its catalogue: U.S. Venous Access ... This study covers U.S. markets for ... (PICCs), central venous catheters (CVCs), dialysis catheters, implantable ...
... Halozyme Therapeutics, Inc. (Nasdaq: HALO ), ... extracellular matrix, today announced that it will host a ... in New York. During the meeting, Halozyme,s management will ... business alliances with Roche and Baxter, and an update ...
Cached Medicine Technology:Reportlinker Adds U.S. Venous Access Catheter Market 2Reportlinker Adds U.S. Venous Access Catheter Market 3Reportlinker Adds U.S. Venous Access Catheter Market 4Halozyme Therapeutics to Host Analyst Meeting on October 14 in New York 2
... national reference laboratory and a worldwide leader ... offers an extensive test menu of highly ... and anatomic pathology. Owned by the University ... than half of the nation's university teaching ...
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
... reference laboratory and a worldwide leader in ... an extensive test menu of highly complex ... anatomic pathology. Owned by the University of ... half of the nation's university teaching hospitals ...
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
Medicine Products: