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Adenoid hypertrophy is a common condition in childhood, which may be associated with recurring acute otitis media (RAOM), otitis media with effusion (OME), and obstructive sleep apnea syndrome (OSAS). These different clinical characteristics have some clinical overlap; however, they might be explained by distinct immunologic and infectious profiles and result in various histopathologic findings of adenoid specimens.<jats:italic>Methods<\/jats:italic>. A total of 59 children with adenoid hypertrophy undergoing adenoidectomy were studied. Three series of identical adenoid specimens were processed to hematoxylin-eosin (H.E.) and Gram staining and to respiratory virus specific real-time PCR, respectively.<jats:italic>Results<\/jats:italic>. According to the clinical characteristics, patients were recruited into three groups: RAOM (). Bacterial biofilms were detected in 21 cases, while at least one of the studied respiratory viruses was detected in 52 specimens. RAOM cases were significantly associated with biofilm existence (). In contrast, OME group was characterized by the absence of bacterial biofilm and by normal mucosa. Showing a statistically significant correlation, all OME cases were positive for human bocavirus (HBoV, ).<jats:italic>Conclusions<\/jats:italic>. Bacterial biofilms might contribute to the damage of respiratory epithelium and recurring acute infections resulting in RAOM. In OME cases persisting respiratory viruses, mainly HBoV, can cause subsequent lymphoid hyperplasia leading to ventilation disorders and impaired immunoreactivity of the middle ear cleft.<\/jats:p>","DOI":"10.1155\/2013\/629607","type":"journal-article","created":{"date-parts":[[2013,9,24]],"date-time":"2013-09-24T01:16:24Z","timestamp":1379985384000},"page":"1-10","source":"Crossref","is-referenced-by-count":18,"title":["Microbiological Profile of Adenoid Hypertrophy Correlates to Clinical Diagnosis in Children"],"prefix":"10.1155","volume":"2013","author":[{"given":"Anita","family":"Szalm\u00e1s","sequence":"first","affiliation":[{"name":"Department of Medical Microbiology, Medical and Health Science Center, University of Debrecen, Nagyerdei Krt. 98, Debrecen 4032, Hungary"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zolt\u00e1n","family":"Papp","sequence":"additional","affiliation":[{"name":"Department of Otolaryngology and Head and Neck Surgery, Medical and 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