infection of respiratory tract caused by fungus
The infection can be caused by bacteria, a virus or even fungi. Upper respiratory tract infections occur above the chest and include: 1  colds (affecting the nose, throat, and chest). 2  sinusitis (infection of the sinuses). 3  throat infection (or pharyngitis â an infection of the throat or pharynx).he infection can be caused by bacteria, a virus or even fungi. Upper respiratory tract infections occur above the chest and include: 1  colds (affecting the nose, throat, and chest). 2  sinusitis (infection of the sinuses). 3  throat infection (or pharyngitis â an infection of the throat or pharynx).