Conversely, nurses and midwives may have over-reported D & A in the observation of provider-patient interaction, due to their high sensitization to D & A. The frequency of D & A typologies varied considerably in both the interviews and observations.
While the public health relevance of chronic exposure to cow allergen has yet to be established, occupational studies of health effects related to Bos d 2 allergen and sensitization in exposed dairy workers suggests that concentrations do not need to be extremely high for sensitization to occur [ 33, 39- 41].
Differences between children with and without asthma are evident from the analysis of the 269 patients recruited for the study from the clinical and allergometric evaluation; actually asthmatic children have higher total IgE values, higher specific IgE values and higher prevalence of sensitization to house dust mite than patients with RC without asthmatic symptoms.
Many people have high sensitization rates to a variety of allergens, but some do not develop AR.
Asthmatic patients have higher total IgE values (P = 0.0003), higher specific IgE values (P = 0.02) and higher prevalence of sensitization to house dust mite (P = 0.002) than patients with RC without asthmatic symptoms.
Previous studies in Ghana [ 26] and other parts of Africa [ 4] have generally reported a higher prevalence of sensitization to dust mite and cockroach allergens as compared to allergens from grass pollen and domestic animals such as cat and dog.
Children living in Hettstedt in eastern Germany have been reported to have a higher prevalence of sensitization to common aeroallergens than another cohort living in the neighboring city of Zerbst; these differences correlated with the presence of industrial air pollution.
Exposures to tea dusts could cause airway obstruction [ 9- 11], and higher prevalence of sensitization to tea was found in tea workers, especially herbal tea workers [ 11, 12], although the relations of tea sensitization status to respiratory symptoms and function were unclear [ 8, 11, 12].
Nevertheless, the presence of higher sensitization in patients with lower frequency of headaches is contrary to what is observed in patients with migraine and co-morbid fibromyalgia syndrome since a higher frequency of migraine attacks enhances both hyperalgesia and widespread pain symptoms [29].
Obviously, sensitization at 4 years of age represented the highest risk for sensitization to the same allergen at 8 years of age, corresponding to an increased risk of 20 times or more after adjustment for the other allergens.
