“…A query on http://www.ncbi.nlm.nih.gov/ with the following keywords: hypersensitivity pneumonitis (HP), bird fanciers Lung, pigeon breeder's disease, farmer's lung and other specific disease names derived from occupational activities followed by each etiology with their synonyms, evaluated the number of publications related to the different etiologies of HP. Thus, by families of similar etiologies we obtained the following number of publications (in-brackets) for: Saccharopolyspora rectivirgula (=Micropolyspora faeni) (632), other actinomyces (148), avian proteins (627), Aspergillus (348), Penicillium (33), yeasts (32), mucorales (30), others fungi (65), mycobacteria (72), enterobacteria (16), eatable fungi (20), mites (33), chemical product (68), biological product (30) [35].…”