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It mainly affects lungs, as the lung is a frequent target of infection including acute bronchitis or pneumonia, which are often caused by viruses, but also can be caused by bacteria or fungal organisms. It is classified as an upper respiratory tract infection or a lower respiratory tract infection. Lower respiratory infections, such as pneumonia, more serious conditions than upper respiratory infections, such as the common cold. Infections of the upper respiratory tract include tonsillitis, pharyngitis, laryngitis, sinusitis, otitis media, certain types of influenza, and the common cold.