Which of these is the most common route of lower respiratory tract infection?
A)Aspiration of oropharyngeal secretions
B)Inhalation of microorganisms
C)Microorganisms spread to the lung via blood
D)Poor mucous 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. Inhalation of microorganisms and spread of organisms via the blood do occur but much less frequently. Poor mucus membrane protection would increase a person's risk of infection but is not a common direct route of infection.

Which of These Is the Most Common Route of Lower