What Is a Low Grade Fever?
Reviewed: Dr. Gromatzky
4. Causes - Respiratory Infections
A respiratory infection, or respiratory tract infection, can be divided into upper respiratory tract infection (URTI) and lower respiratory tract infection (LRTI). Examples of URTIs include pharyngitis, tonsillitis, otitis media, sinusitis, laryngitis, influenza, and the common cold.
LRTI involves the bronchial tubes, lungs, bronchioles, and trachea. Some examples include pneumonia and bronchitis. LRTIs are usually more serious than URTIs. In respiratory infections, the body raises the body temperature to help fight off the infection. Most respiratory infections are caused by viruses. Children can often have multiple infections that causes the fever to seem to last longer.
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