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Keywords COVID-19 bacteriological testing children chronic adenotonsillar disease chronic frontal sinusitis chronic tonsillitis endoscopic nasal sphenoethmoidectomy frontal sinus functional endoscopic sinus surgery hearing loss immune system nasal flora nasal mucosa nasal swab nasopharyngeal microbiota otorhinolaryngology throat flora throat swab tonsillectomy tympanoplasty vasomotor rhinitis