Otitis media and sinusitis are usually preceded by a(n)

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Otitis media and sinusitis are both infections that occur in the middle ear and sinuses, respectively. These infections are usually preceded by a nasopharyngeal infection. The nasopharynx is the area at the back of the nose where the nose and throat meet, and it is a common site of infection for many respiratory viruses and bacteria. Infection in the nasopharynx can travel up to the middle ear or sinuses, leading to otitis media or sinusitis, respectively.

Otitis Media and Sinusitis Are Usually Preceded by A(n)