Factors predisposing to the development of allergies X.

1 SUMMARY The prevalence of atopic disorders has been increasing at last years. One of the notions is that this is caused by unsatisfactory stimulation of immune system by infectious diseases ("the hygiene hypothesis"). The aim of our study was determine the influence of infectious diseases, the adenoidectomy, tonsillectomy, using of antibiotics on the development of atopic diseases. We availed the questionnaire survey which included 2050 children born approximately on 1994, who attended a primary school at various places of Czech Republic. We separate them to allergic and nonallergic, according to certain criteria. We asked about three periods: the first two years of life, period when child moved from a kindergarten to a primary school (years 1999, 2000) and last two years before answer on our questionnaire. We found, that the allergic children significantly more than the nonallergic suffered from: otitis media (49,6% vs. 42.5%; 44.5% vs. 25.7%; 13.3% vs. 6.0%), sinusitis (12.5% vs. 5.2%; 26.2% vs. 9.2%; 18.2% vs. 6.2%), nasopharyngitis or rhinitis (88.5% vs. 79.5%; 94.1% vs. 81.4%; 88.4% vs. 76.7%), bronchitis (65.8% vs. 38.4%; 72.9% vs. 35.3%; 46.0% vs. 20.8%), pneumonia (14.3% vs. 6.0%; 21.1% vs. 7.5%; 3.8% vs. 1.5%), influenza or other virosis with increased body temperature (80.4% vs. 72.0%; 91.3% vs...