Respiratory tract infection

Respiratory tract infection
Conducting passages
Specialty	Infectious disease

Respiratory tract infections (RTIs) are infectious diseases involving the lower or upper respiratory tract.^[1] An infection of this type usually is further classified as an upper respiratory tract infection (URI or URTI) or a lower respiratory tract infection (LRI or LRTI). Lower respiratory infections, such as pneumonia, tend to be far more severe than upper respiratory infections, such as the common cold.