Navigation Links
As Earth Warms, Lyme Disease Could Flourish
Date:4/23/2009

Study warns that climate changes affect deer tick's life cycle,,

THURSDAY, April 23 (HealthDay News) -- Global warming may increase the severity of Lyme disease by changing the feeding habits of the deer ticks that transmit it, new research has found.

During its two-year life span, a deer tick goes through three stages: larval, nymphal and adult. To survive, a tick must obtain a blood meal during each stage.

If the source of the first meal (mouse, bird or other small animal) is infected with the bacterium that causes Lyme disease, the tick also becomes infected. The tick can then pass the infection to its next meal, which could be wildlife or a human, during its nymph stage.

The seasonal cycle of feeding for each stage of a tick's life determines the severity of infection in a given region, according to the study in the April issue of Applied and Environmental Microbiology.

In the moderate climate of the Northeastern United States, larval deer ticks feed in the late summer, long after the spring feeding of infected nymphs. This long gap between feeding times directly correlates to more cases of Lyme disease reported in the Northeast.

When there is a longer gap, the most persistent infections are more likely to survive, the study's co-author, Durland Fish, a professor of epidemiology at the Yale School of Public Health, said in a Yale news release. These persistent bacterial strains cause more severe disease in humans, leading more people to seek medical attention and resulting in more case reports.

But in the Midwest, greater extremes of temperature mean a shorter time in which ticks can feed and, therefore, a shorter gap between nymphal and larval feedings.

Midwestern wildlife and ticks tend to be infected with less persistent strains, which correlates with fewer cases of Lyme disease in the Midwest.

As the planet warms, the researchers said, the Upper Midwest could more closely resemble the Northeast: longer gaps between nymphal and larval feeding and stronger, more persistent strains of Lyme disease.

Other diseases, such as malaria, have been projected to expand the geographic region in which they occur in response to climate change, said Maria Diuk-Wasser, assistant professor of epidemiology at Yale and senior author of the study.

But she said this was the first study to show how the severity of disease can also be related to climate.

One of the first symptoms of Lyme disease is often a rash at the site of the bite. Though treatable with antibiotics, the disease can cause fatigue, chills, fever, headache, muscle and joint aches and swollen lymph nodes.

More information

The U.S. Centers for Disease Control and Prevention has more on Lyme disease.



-- Jennifer Thomas



SOURCE: Yale University, news release, April 21, 2009


'/>"/>
Copyright©2009 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. The science behind the food we eat and the earth on which it grows
2. Earths Oxygen May Have Arrived Earlier
3. ASTAR Air Cargo, The Church of Jesus Christ of Latter-day Saints and DHL to Help Peruvian Earthquake Victims
4. Childrens Hospital Los Angeles Turns Off the Tap With Green Earth Waterless Carwash
5. Europes Columbus laboratory leaves Earth
6. Earth from Space: Splitting iceberg
7. New portrait of Earth shows land cover as never before
8. Nature Made(R) Liquid Softgels Help Fuel Oprahs A New Earth Web Event
9. Whole Foods Market(R) Announces Eco-Conscious Youth Hosts for Whole Earth Generation(TM) Show
10. Contract signed for ESAs Sentinel-3 Earth observation satellite
11. Mannatech Goes Green and Supports Local Earth Day Celebrations
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
As Earth Warms, Lyme Disease Could Flourish
(Date:6/25/2016)... ... June 25, 2016 , ... Dr. Calvin Johnson has dedicated ... has implemented orthobiologic procedures as a method for treating his patients. The procedure ... doctors to perform the treatment. Orthobiologics are substances that orthopaedic surgeons use to ...
(Date:6/24/2016)... ... ... Those who have experienced traumatic events may suffer from a complex set ... drug or alcohol abuse, as a coping mechanism. To avoid this pain and suffering, ... traumatic event. , Trauma sufferers tend to feel a range of emotions, from depression, ...
(Date:6/24/2016)... ... June 24, 2016 , ... Global law firm Greenberg ... Legal Elite. The attorneys chosen by their peers for this recognition are considered among ... Greenberg Traurig Shareholders received special honors as members of this year’s Legal Elite Hall ...
(Date:6/24/2016)... ... 24, 2016 , ... People across the U.S. are sharpening their pencils and ... essay contest in which patients and their families pay tribute to a genetic counselor ... National Society of Genetic Counselors (NSGC) Annual Education Conference (AEC) this September. , ...
(Date:6/24/2016)... ... June 24, 2016 , ... ... feeding the Frederick area economy by obtaining investment capital for emerging technology companies. ... 2½ years that have already resulted in more than a million dollars of ...
Breaking Medicine News(10 mins):
(Date:6/26/2016)... June 26, 2016 Story ... operating models within the health care industry is causing ... efficiency , Deloitte offers a suite of solutions ... issues impacting efficient cost optimization: labor resource analysis, revenue ... services facilitate better outcomes and better economics ...
(Date:6/24/2016)... 2016 Dublin ... addition of the " Global Markets for Spectroscopy ... This report focuses on the ... review, including its applications in various applications. The report ... includes three main industries: pharmaceutical and biotechnology, food and ...
(Date:6/24/2016)... Research and Markets has announced the addition of ... report to their offering. ... The World Market for Companion Diagnostics covers the world market ... the report includes the following: , World ... Region (N. America, EU, ROW), 2015-2020 , World IVD ...
Breaking Medicine Technology: