Navigation Links
Flu virus trots globe during off season
Date:9/20/2007

The influenza A virus does not lie dormant during summer but migrates globally and mixes with other viral strains before returning to the Northern Hemisphere as a genetically different virus, according to biologists who say the finding settles a key debate on what the virus does during the summer off season when it is not infecting people.

"Nobody really knows why flu is a winter disease in the temperate regions and more continuous in the tropics," says Edward Holmes, professor of biology at Penn State. "The big question is, Why is flu seasonal""

Flu infections in the Northern Hemisphere typically follow a familiar pattern. Some time before the start of the winter infection season, the virus evolves, changing enough to evade the previously primed immune system. Then, just before summer, the virus disappears, only to resurface the next fall with a completely different genetic makeup, ready to fool the immune system anew.

But little is known about what happens to the virus between two successive winters, or how and where it is able to sustain itself.

The key question, Holmes explains, is whether the virus settles into a dormant state waiting for the right cues of temperature and sunlight to reactivate, or whether it migrates to viral reservoirs in the tropics, from where it is later reintroduced.

It is thought that places in Southeast Asia, where humans and animals live in close proximity, might be the permanent melting pot where viruses continually circulate and exchange genetic information.

To test the migration theory, Holmes and Martha Nelson, graduate student at Penn State, and their colleagues at the National Institutes of Health, Lone Simonsen, Cecile Viboud, and Mark A. Miller, analyzed the influenza A virus genomes of 900 virus samples from New Zealand, Australia and New York state dating between 1998-2005.

Their findings, outlined in this month's issue of PLoS Pathogens, reveal that the genomes of 52 viruses from Ne
'/>"/>

Contact: Amitabh Avasthi
axa47@psu.edu
814-865-9481
Penn State
Source:Eurekalert

Page: 1 2 3

Related medicine news :

1. Virus Level could Predict Cervical Cancer Risk
2. Ebola Virus - Outbreak Claims More Lives In Uganda.
3. Experimental treatment for Ebola Virus Shows promising results in mice
4. Virus Combats Brain Tumour
5. Virus killer
6. Minor mutations in HIV virus
7. Virus makes Hodgkin’s disease more deadl
8. Infertility in relation with virus
9. Birds breed viruses
10. Hidden influenza virus protein found
11. Pain Killers Keep the Virus Away
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/14/2014)... Documented Legacy , a mobile personal ... of its first military memoir about a World War II ... October 1943 and 19 months as a prisoner of war ... the American dream. , From the Top Turret: A ... (Amazon) is a true life story of Gerard Caporaso’s ...
(Date:7/14/2014)... 2014 The Retina Group of ... Hauppauge, NY, has announced the availability of Ozurdex® ... diabetic macular edema (DME) patients. Ozurdex, a corticosteroid ... indication for use in diabetic macular edema. Ozurdex ... for treatment of retinal vascular occlusions and and ...
(Date:7/14/2014)... 14, 2014 According to a recent ... researchers have discovered a connection between women with high ... of infertility. Although doctors have theorized about the role ... first study to provide scientific support. , “Stress, if ... said Dr. Larry Barmat, an OB/GYN who specializes in ...
(Date:7/14/2014)... 2014 Last month Bromell Agency officially ... The webpage features more detailed information on how clients ... RVs, ATVs, and boats in the state of Louisiana. ... feature to the website in order to better educate ... the purpose of the website, which is to display ...
(Date:7/14/2014)... 14, 2014 There’s an old adage that ... The Lash Palette say the products offered in their ... , “You can reserve The Lash Palette for $40,” said ... Store . , Paris explained that the first 1,000 have ... 21. , She went on to point out that her ...
Breaking Medicine News(10 mins):Health News:Mount Laurel-based Documented Legacy to Release Military Memoir of World War II Air Force Vet Who Survived Black Thursday Crash 2Health News:Retina Group of New York Now Offers Long-lasting Ozurdex® Treatment for Diabetic Retinopathy 2Health News:Retina Group of New York Now Offers Long-lasting Ozurdex® Treatment for Diabetic Retinopathy 3Health News:Abington Health Physician Addresses Link Between Stress and Infertility 2Health News:Abington Health Physician Addresses Link Between Stress and Infertility 3Health News:The Lash Palette Preorder Event Has Officially Begun 2
... , , WASHINGTON , Feb. 8 ... showed he has what it takes to win big. Not only does ... own Milk Mustache. The 13th annual winning football Milk Mustache ad runs ...   http://www.newscom.com/cgi-bin/prnh/20100208/AQ51302 ) , The famed running back is the latest superstar ...
... Nev. , Feb. 8 The Whittemore Peterson ... Donnica Moore , a distinguished women,s health expert, as its ... in its efforts to help raise awareness and funding for ... Fatigue Syndrome.   , "We are pleased to have a ...
... ... Health, a joint venture between Humility of Mary Health Partners (HMHP) , NEO ... Ohio,s first and only radiation oncology center with Elekta Volumetric Modulated Arc Therapy (VMAT), ... ...
... , , NORTHBROOK, Ill. , ... a global leader in environmental evaluation and certification, announces ... materials used in consumer and manufactured goods.  These standards ... scientific assessment and broad stakeholder collaboration.   , This ...
... the use of computed tomography (CT scans) in children ... of scans, according to a new study in ... link only) http://www.cmaj.ca/embargo/cmaj091421.pdf . More than 650,000 ... consciousness, amnesia, disorientation and/or vomiting are seen each year ...
... JRS Medical ... that the Company is donating a percentage of all of their January & February 2010 ... employees also are raising funds locally for victims of the tragic earthquake. , ... (PRWEB) February 8, 2010 -- JRS Medical ...
Cached Medicine News:Health News:Reggie Bush Takes Down Reggie Wayne in Battle for the Milk Mustache! 2Health News:Whittemore Peterson Institute Announces Renowned Health Expert as New Spokesperson 2Health News:Partners for Urology Health First in Ohio with New Radiation Therapy Technology 2Health News:Partners for Urology Health First in Ohio with New Radiation Therapy Technology 3Health News:UL Environment to Develop Sustainability Standards For Plastic 2Health News:New CATCH rule to determine need for CT scans in children with minor head injury 2Health News:JRS Medical Raises Funds for Devastated Victims in Haiti 2Health News:JRS Medical Raises Funds for Devastated Victims in Haiti 3
(Date:7/14/2014)... July 14, 2014 CVS/pharmacy ® ... PLATINUM, a premium brand of 100% preservative-free vitamins ... growing family of exclusive CVS/pharmacy store brand products. ... with various benefits, including popular options such as ... women. The radiance PLATINUM line also has more premium options ...
(Date:7/14/2014)... , July 14, 2014 The legalization of ... – as well as a new economic driver – ... to sort out the right response to the will ... intoxicant. At a National Press Club ... a.m., two leading experts in the area of marijuana ...
(Date:7/14/2014)... N.Y. , July 14, 2014 We ... Surgery Center ("OACM") and the Ellicott City Ambulatory Surgery ... of Ellicott City Maryland . ... between Merritt Healthcare and 14 leading Orthopaedics, Sports Medicine, ... Facility will also accommodate the specialties of general surgery ...
Breaking Medicine Technology:CVS/pharmacy Launches Exclusive radiance PLATINUM Line of Preservative-Free Vitamins and Supplements 2CVS/pharmacy Launches Exclusive radiance PLATINUM Line of Preservative-Free Vitamins and Supplements 3NPC Newsmaker Program: Interpreting smoke signals from the marijuana skirmish line 2
... 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 ...
... Laboratories is a national reference laboratory and ... and development. ARUP offers an extensive test ... tests in clinical and anatomic pathology. Owned ... clients include more than half of the ...
... 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 ...
... ARUP Laboratories is a national reference laboratory ... research and development. ARUP offers an extensive ... medical tests in clinical and anatomic pathology. ... Laboratories' clients include more than half of ...
Medicine Products: