Respiratory tract infections include diseases affecting the nose, throat, and ears, and they're quite common, especially in children. Colds, for instance, often affect the ears, which is normal. In more severe cases, the connection between the nose and ears through the Eustachian tube can lead to blockages, collecting viruses or bacteria and potentially causing more serious problems like otitis. These respiratory infections, from mild colds to severe otitis, may come with varying degrees of fever. It's crucial to consult with a pediatrician or general practitioner to identify the right and effective treatment.