This book serves as a practical and comprehensive guide to diagnosing and treating infections of the ears, nose, throat, and sinuses. This second edition updates the chapters from the first edition and adds five new chapters, including several on COVID-19. The 35 chapters have been contributed by otolaryngologists and infectious disease specialists who are experts in the field. Topics include common infections such as otitis media, otitis externa, pharyngitis, laryngitis, and acute bacterial sinusitis as well as less common infections such as mumps, scrofula, malignant otitis externa, Lemierre's syndrome, invasive fungal sinusitis, cervical lymphadenitis, and deep neck infections. Chronic sinusitis, antibiotic-resistant infections, labyrinthitis, human papillomavirus-related neoplasms, osteoradionecrosis of the mandible, and dental and oral cavity infections are also discussed. A newly added section addresses COVID-19 in otolaryngology, including infection prevention measures, upper respiratory tract manifestations, and the chronic loss of taste and smell that may follow the acute viral infection. Written with the practicing clinician in mind, this second edition of Infections of the Ears, Nose, Throat, and Sinuses will be an invaluable aid to otolaryngologists, infectious disease specialists, pediatricians, primary care providers, advanced practice providers, nurses, and other clinicians who provide care to patients with these types of infections.