Trisetum paniceum (wild oats) pollen counts and aeroallergens in the ambient air of Madrid, Spain.
BACKGROUND
Madrid has a short but intensive grass pollen season, in which 79% of the total grass pollen load is released from the middle of May to the middle of June. The main objectives of this study were to quantify Trisetum paniceum (wild oats) aeroallergen in the atmosphere in Madrid from February to December 1996 and to correlate the aeroallergen concentrations with grass pollen counts.


METHODS
Two different samplers were used to assess allergen exposure; a Burkard spore trap was used to collect pollen grains and a high-volume air sampler to collect airborne particles. A total of 182 air filters were collected and extracted in 1 ml of PBS and analysed by ELISA inhibition, using pooled sera from highly allergic individuals.


RESULTS
T. paniceum aeroallergens were detected not only during the grass pollen season, but also before and after. Wild oat allergens had two main peaks of 1 and 1.9 microg/m(3), occurring in late May and July, respectively. The time series analysis established the existence of lags between the two main variables pollen counts and aeroallergen activity. Analysis of the data by the Spearman rank test and linear regression showed a weak correlation between grass allergenic activity and grass pollen counts (Spearman's rho = 0.29). Data obtained from time series analysis demonstrated that grass allergenic activity correlated strongly with current and 5-week-old grass pollen grain counts (r(2) = 0.73).


CONCLUSIONS
Wild oats allergenic activity was detected during the entire year and not only during the pollen season. This fact is an important aspect to be considered in the clinical follow-up and treatment of grass pollen-sensitised patients in Madrid.
Cabrera
M
M
Alergia e Inmunologia, Hospital Clínico San Carlos, Complutense University of Madrid, Madrid, Spain. diecab@teleline.es
Martínez-Cócera
C
C
Fernández-Caldas
E
E
Carnés Sánchez
J
J
Boluda
L
L
Tejada
J
J
Subiza
J L
JL
Subiza
J
J
Jerez
M
M
D000393:Air Pollutants / Q000032:analysis* / Q000276:immunology; D000485:Allergens / Q000032:analysis* / Q000276:immunology; D018554:Avena / Q000276:immunology*; D003429:Cross Reactions; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D010940:Plant Proteins / Q000032:analysis* / Q000276:immunology; D011058:Pollen / Q000276:immunology*; D012044:Regression Analysis; D012621:Seasons; D013030:Spain; D018709:Statistics, Nonparametric
D000393:Air Pollutants; D000485:Allergens; D010940:Plant Proteins