Navigation Links
Climate Change Extending Ragweed Season in Colder Climes: Study
Date:2/21/2011

By Serena Gordon
HealthDay Reporter

MONDAY, Feb. 21 (HealthDay News) -- People with ragweed allergies who live in northern climates aren't imaging that their misery is lasting longer and longer each year.

New research suggests that for people living in some northern U.S. states, the length of ragweed season has gotten longer by more than two weeks, and for people living in some areas of Canada, the ragweed season has stretched by nearly a month.

"This study is a confirmation of what the Intergovernmental Panel on Climate Change has been projecting. We've gone from a theoretical projection of changes in the timing of ragweed season, to boots on the ground starting to see it happen," said study author Lewis Ziska, a plant physiologist at the Agricultural Research Service at the U.S. Department of Agriculture, in Beltsville, Md.

"This is a caution light. Pollen seasons may be getting longer, and climate change may have health implications as well," he said.

Ziska's findings are published in this week's online issue of the Proceedings of the National Academy of Sciences.

Ragweed allergies are very common in the United States. At least one in 10 people in the United States is sensitive to ragweed pollen, according to background information in the study. For people who have any type of allergy, about 27 percent have a ragweed sensitivity.

And, the study reports, the prevalence of allergic disease has been increasing in the United States over the past three decades. Exactly why is unclear, but many experts suspect that changes in the global climate may be causing longer pollen seasons, which increase the duration of exposure to allergens.

If this theory were true, said Ziska, then it would make sense that the length of the ragweed pollen season -- which is dependent on warm, but not too hot, temperatures -- would be getting shorter in southern latitudes and longer in northern latitudes.

To test this hypothesis, Ziska and his colleagues reviewed 15 years of pollen data from eight locations in the United States and two in Canada.

Two out of three southern locations -- Georgetown, Texas, and Rogers, Ark. -- experienced shorter ragweed seasons by three or four days in 2009 compared to 1995. Oklahoma City saw a one-day increase in its ragweed season during the same time period.

As the researchers went up in latitude from there, however, the length of ragweed season increased dramatically from 1995 to 2009. Papillion, Neb., had an increase of 11 days, while two spots in Wisconsin -- Madison and LaCrosse -- saw an increase in their ragweed season of 12 and 13 days, respectively.

Minneapolis and Fargo, N.D., saw their ragweed season increase in length by 16 days. And, in Canada, Winnipeg's season lengthened by 25 days, and allergy sufferers in Saskatoon were sneezing for 27 extra days.

"If this trend continues, and we see greater warming to the poles, allergy seasons will be different and, for some, they'll be extended," said Ziska.

So, what does this potentially longer season mean for you if you live in a northern climate?

"For people who have experienced mild ragweed seasons, they may experience more problems than in the past," said Dr. Jay Portnoy, chief of the section of Allergy, Asthma and Immunology at Children's Mercy Hospitals and Clinics in Kansas City, Mo.

"It will be a longer season for those who had shorter seasons. And, pollen levels have increased, too. Not only is the total amount of pollen increased, but the pollen is more potent, too. Patients who have ragweed allergy will suffer more," he said.

"This may change the timing of preventive medications, and for physicians trying to diagnose allergic disease, they may need to change their assumptions about what's in the air," Portnoy explained.

More information

Read more about climate change and the effects on people with allergies from the American College of Allergy, Asthma and Immunology.

SOURCES: Lewis H. Ziska, Ph.D., plant physiologist, Agricultural Research Service, U.S. Department of Agriculture, Crop Systems and Global Change, Beltsville, Md.; Jay M. Portnoy, M.D., chief, section of Allergy, Asthma and Immunology, Children's Mercy Hospitals and Clinics, Kansas City, Mo.; Feb. 22-26, 2011, Proceedings of the National Academy of Sciences, online


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. New clues found linking larger animals to colder climates
2. National Climate Organizations Join Forces In Historic Push For Climate and Clean Energy Solutions
3. Johns Hopkins Launches “Energy Policy and Climate” Master's Degree
4. China's Forbidden City Leads Landmark Climate Action for Earth Hour
5. Working Lands Key to Affordable Energy and Climate Bill, Coalition Tells Lawmakers
6. £3M awarded for climate model to predict disease outbreak
7. IT Leaderboard Showcases Growing Divide Between Talk and Action on Developing Climate Solutions
8. How pest insects might adapt to climate change, affecting agriculture and health
9. Holistic Management and Allan Savory Win the 2010 Buckminster Fuller Award for Turning Deserts into Thriving Grasslands and Combating Climate Change.
10. When climate change becomes a health issue, are people more likely to listen?
11. New state surveys affirm Americans support for government action on climate change
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Climate Change Extending Ragweed Season in Colder Climes: Study
(Date:2/9/2016)... (PRWEB) , ... February 09, 2016 , ... Establishment Labs, ... of Dr. David Hung to the company´s Board of Directors. , “We ... class scientist and an exceptional entrepreneur.” said Juan Jose Chacon Quiros, CEO of Establishment ...
(Date:2/9/2016)... ... 09, 2016 , ... ZipHearing.com is proud to ... hearing aids , increase industry transparency, and promote awareness of hearing solutions ... “For the average consumer, the hearing aid industry is esoteric and difficult to ...
(Date:2/9/2016)... ... February 09, 2016 , ... Sir Grout, ... , is proud to announce that many of their franchises have received the ... The hard surface restoration franchises received customer recognition through positive reviews and testimonials, ...
(Date:2/8/2016)... , ... February 08, 2016 , ... ... its newly redesigned website, federallabs.org . The site houses a wealth of ... available federal technologies through the process called technology transfer (T2). As a network ...
(Date:2/8/2016)... ... ... man who has struggled to quit smoking, a man who has struggled with hair loss ... to his problems – and he did. Now Nabat, a serial entrepreneur featured as the ... inventions to the world and better people's lives. His own experience with nicotine addiction led ...
Breaking Medicine News(10 mins):
(Date:2/8/2016)... 2016 Aesthetic Devices - Medical Devices Pipeline ... report, "Aesthetic Devices - Medical Devices Pipeline Assessment, 2015" ... stage. This report is prepared using ... by GlobalData,s team of industry experts. *Note: Certain ... based on the availability and relevance of data in ...
(Date:2/8/2016)... 2016  Ventana Medical Systems, Inc. (Ventana), a member ... world,s top oncologists, pathologists, research scientists and healthcare ... annual Tucson Symposium March 8-9 to learn ... outcomes in cancer research and treatments that will ... Thomas Grogan , annually draws more than 500 ...
(Date:2/8/2016)... LEAWOOD, Kan. , Feb. 8, 2016 ... held organization that formerly specialized in the ... facilities, recently announced that it has divided ... Nueterra Capital. While Nueterra Capital will continue ... advisory services, NueHealth will operate a national ...
Breaking Medicine Technology: