Navigation Links
Get ready for spring - hay fever worse in spring than summer
Date:12/20/2011

Hay fever (runny nose, sneezing, itchy eyes) is caused by an allergy to pollen, and most commonly to grass pollen. These tiny grains bring misery to sufferers through spring and summer and pollen levels are often included as part of weather reports to help sufferers prepare. However new research published in BioMed Central's open access journal Clinical and Translational Allergy shows that, regardless of medication and other allergies, for the same grass pollen levels, hay fever symptoms are worse in the first half of the season than later on.

Worldwide there are over 10,000 species of grass and most of these species are able to cause symptoms in people who have hay fever. The different species release their pollen sequentially so that, for a sufferer, hay fever, also called seasonal allergic rhinitis, can last for the whole three months that grasses are flowering.

Researchers from Netherlands compared daily pollen counts with daily symptoms reported by hay fever sufferers (with a positive skin test to grass pollen) living around Leiden. The people involved in the study were also tested for other common allergies including birch pollen (birch releases its pollen just before the start of the grass pollen season), house dust mites, dogs and cats. The study covered the consecutive hay fever seasons of 2007 and 2008.

Symptoms of hay fever definitely matched the concentration of pollen in the air and also the amount of medication taken. Higher medication use was seen during days with high pollen counts and severe symptoms, while less medication was taken on days with low pollen counts and milder symptom severity.

Surprisingly the symptom scores at the beginning of the season were higher than scores at the end of the season for a similar pollen count. This could not be accounted for by medication taken such as antihistamines, nor by the long term use of nasal steroids. The birch pollen season precedes grass pollen and over half of the sufferers were also allergic to birch. However the results showed that having both allergies also could not explain the differences between symptom scores in the beginning and the end of the season.

Dr Letty de Weger, from Leiden University Medical Centre, who led the research explained, "It is possible that sufferers report their symptoms as milder later in the season because they get used to their hay fever, or that the pollen from late flowering species is less allergenic than pollen from early flowering grass. However there has been other work which suggests that high exposure to grass pollen early in the season may down regulate inflammation on subsequent contact possibly via the production of allergen specific regulatory T cells."
'/>"/>

Contact: Dr Hilary Glover
hilary.glover@biomedcentral.com
44-020-319-22370
BioMed Central
Source:Eurekalert

Related biology news :

1. Ready for their close-up
2. Magnetic tongue ready to help produce tastier processed foods
3. Study shows that new DNA test to identify Down syndrome in pregnancy is ready for clinical use
4. Shape memory materials ready for mass production
5. Scotlands first marine reserve already producing benefits
6. New ocean acidification study shows added danger to already struggling coral reefs
7. How some plants spread their seeds: Ready, set, catapult
8. Europe ready to launch 3-D TV outperforming the competition
9. BIO-key® to Unveil Enterprise Ready Biometric Identity Platform for Smartphones at the Burton Group Catalyst Conference
10. CryoSat-2 ready for launch
11. Induced neural stem cells: Not quite ready for prime time
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/30/2017)... HONG KONG , March 30, 2017 ... developed a system for three-dimensional (3D) fingerprint identification by adopting ground ... technology into a new realm of speed and accuracy for use ... applications at an affordable cost. ... ...
(Date:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... , Mar 24, 2017 Research and ... Access System Market Analysis & Trends - Industry Forecast to 2025" ... ... to grow at a CAGR of around 15.1% over the next ... This industry report analyzes the market estimates and forecasts for all ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... (PRWEB) , ... October 12, ... ... ) has launched Rosalind™, the first-ever genomics analysis platform specifically designed for ... complexity. Named in honor of pioneering researcher Rosalind Franklin, who made a ...
(Date:10/11/2017)... ... 11, 2017 , ... ComplianceOnline’s Medical Device Summit is back for its 4th ... in San Francisco, CA. The Summit brings together current and former FDA office bearers, ... and government officials from around the world to address key issues in device compliance, ...
(Date:10/11/2017)... ... , ... Disappearing forests and increased emissions are the main causes of the ... Especially those living in larger cities are affected by air pollution related diseases. , ... pollution-affected countries globally - decided to take action. , “I knew I had to ...
(Date:10/10/2017)... ... October 10, 2017 , ... ... (ADC) therapeutics, today confirmed licensing rights that give it exclusive global access ... developed in collaboration with Children’s Hospital Los Angeles (CHLA). Additionally, an ...
Breaking Biology Technology: