الفهرس 
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Abstract
Pollen constitutes a major source of atmospheric pollution causing a number of allergic disorders like rhinitis and asthma among the people living around the world. Although that, there is little information about the prevalence of these conditions in populations with different pollen exposures.
The current study was carried out to evaluate the prevalence of sensitization against pollen allergens as assessed by skin prick tests in Egyptian people having allergic diseases like; asthma, and allergic rhinitis in order to improve the management.
This cross sectional study included 200 patients aged 6 to 68 years and suffering from one or more of allergic diseases such as bronchial asthm, or/and allergic rhinitis (AR).
Our studied patients were chosen from those attending the immunology and allergy out clinic of Ain shamsUniversity Hospital from April to August 2014.
Our studied patients were subjected to:
1) A detailed allergic history and thorough clinical examination and ENT. examination
2) Skin prick test that was carried out to all atopic patients with standardized allergen extracts and validated method against the following ten pollen allergens: ray grass, 12 Grasses, Bermuda grass, plantain, fat hen, Mugwort, Russian thistle, Birch, Cyrus and Betulaceae.
3) Asthmatic patients in our study were investigated with spirometry.
Our results showed that:
There is a low prevalence of pollen sensitization among studied atopic Egyptian patients (25%).
According to skin prick test results, our patients were divided into 2 groups; positive (50/200) and negative (150/200) groups. Comparison between the two groups showed that there is:
Pollen apparently seems to play a triggering role in the development of polysensitization, as polysensitization was recorded more frequently than monosensitization (60% vs. 40%) in our sensitized studied patients.
The most predominant SPT positivity was Grasses (60%), followed by platain (48%), 12 grass (36%), fat hen(20%), Mugwort ,cyprus and Betulaceae (16%), English plantain and Willow (20%) and the least predominant was Russian thistie (8%).
Among the sensitized patients, 100% had positive SPT to at least one grass allergen, 63% to at least one weed allergen and 44% to tree pollens in our study. So, we could consider that sensitizations to grasses were more common than Weeds in our study.
There is a large sample of asthmatic patients102 patients (51%) among our studied patients, in comparison with allergic rhinitis 58 patients (29%), and 40 patients with asthma and allergic rhinitis.
There is no significant risk prediction between sex in pollen exposure.
Statistically no significant correlation between Age, pollen exposure and SPT positivity.
No significant correlation between sex and SPT reactivity.
No significant relationship of SPT positivity with asthma, allergic rhinitis.
A significant correlation between pollen sensitization and family history.
There is a low prevalence rate of sensitization against pollen allergens in Egyptian patients having atopic diseases like; asthma and allergic rhinitis.