Invasion of the host RESPIRATORY SYSTEM by microorganisms, usually leading to pathological processes or diseases.
Also Known As:
Respiratory Tract Infection; Respiratory Infections; Upper Respiratory Infections; Infections, Respiratory; Infections, Respiratory Tract; Infections, Upper Respiratory; Infections, Upper Respiratory Tract; Infection, Respiratory System; Infection, Respiratory Tract; Respiratory Infection, Upper; Respiratory System Infection; Respiratory System Infections; Upper Respiratory Tract Infection; Upper Respiratory Tract Infections