The most common route of lower respiratory tract infection is:
A)aspiration of oropharyngeal secretions.
B)inhalation of microorganisms.
C)microorganisms spread to lung via blood.
D)poor mucus membrane protection.

Question

Quizplus · Accepted Answer

Aspiration of oropharyngeal secretions is the most common route of lower respiratory tract infection; thus the nasopharynx and oropharynx constitute the first line of defense for most infectious agents.

The Most Common Route of Lower Respiratory Tract Infection Is