IGHE and asthma: Even though several epidemiological and clinical studies show that mite exposure in the tropics is perennial[8-10] and this may induce a sustained and strong IgE response, 2 important points deserve further investigation: first, the high frequency and intensity of the IgE response to mite allergens, [2,11-15] and second, the high prevalence of asthma observed in some urban zones of this region [16-26].