IGHE and asthma: Furthermore, although it is possible that the high sensitization rates to Blattella germanica noted in the present study may possibly be a result of cross reactivity with IgE for Der p or Der f; a study by Sun and colleagues [36] investigating the prevalence of sensitivity to cockroach allergens and IgE cross-reactivity between cockroach and house dust mite allergens in Chinese patients with allergic rhinitis and asthma seems to suggest that this is unlikely to be the case.