Miguatemala Health Blog

* Grasses:

The grasses (Poaceae or Gramineae) are the leading cause of allergy in our country and distributed by the central and northern Spain. Although it includes several thousand species, is the Pooideae subfamily that contains the most important genera that produce hay (Phleum, Dactylis, Lolium, Trisetum, etc.). They are weeds growing in roadsides, fields or open fields. Atmospheric concentrations of grasses vary from year to year. In Castilla León, Castilla La Mancha, Extremadura and the interior of Levante and Andalusia, the concentration that occurs from April to July is related to rainfall preseasonal, ie that recorded between October and March. Its pollination period is very large since the flowering of each of its species occur in a given time. Although the so-called Green Spain (Galician and Cantabrian mountain) is a high concentration of grass pollination is moderate and it rains a lot in the months of flowering.

Oleas:

The Oleaceae family includes many trees and shrubs although only three significantly influence the atmospheric burden: Fraxinus (February-March), Olea (April-June) and Ligustrum (July). El Olivo is the most frequent and abundant allergen in the Mediterranean area, so it also affects other countries such as Italy, Israel, Greece, Turkey and Portugal. After the grass, the olive tree is the second leading cause of allergy in Spain. Jaen is the province most affected, since 62 percent of its area is devoted to the extension and 95 percent of allergy sufferers are sensitive to the olive tree. Other areas affected are Córdoba, Sevilla, Malaga, Granada, Cuidad Real and Toledo.

* Parietaria (Urticaceae):

The Parietaria is a family of highly allergenic weeds and is a major source of allergenic pollen in the Mediterranean coastal regions. The most important is the Parietaria judaica which is in solar and walls of these areas. The pollination period extends from February to November giving a multiestacional and perennial symptoms sometimes can be confused with chronic rhinitis or asthma. This is favored by the late appearance of this type of hay fever in patients over 30 years of age. The most affected provinces are Barcelona, Murcia and Valencia with a prevalence ranging between 25 and 50 percent of patients with hay fever. Their presence is also important in northern Spain, especially in La Coruna, where it affects 28 percent of the population, and in Bilbao, the incidence reaches 4 percent.

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