The portal of entry for the diphtheria agent is through the respiratory tract.

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Multiple Choice

The portal of entry for the diphtheria agent is through the respiratory tract.

The main idea here is identifying where the diphtheria-causing organism first enters the body. Corynebacterium diphtheriae is spread mainly by respiratory droplets and typically establishes infection on the mucosal surfaces of the upper airway—the nasopharynx and oropharynx. Because the initial contact and colonization occur in the respiratory tract, that is the portal of entry. Skin or gastrointestinal routes are not the usual means by which diphtheria is acquired, though rare wound infections can occur, they are not the typical portal. So the statement that entry is through the respiratory tract best reflects the organism’s common route of infection.

The main idea here is identifying where the diphtheria-causing organism first enters the body. Corynebacterium diphtheriae is spread mainly by respiratory droplets and typically establishes infection on the mucosal surfaces of the upper airway—the nasopharynx and oropharynx. Because the initial contact and colonization occur in the respiratory tract, that is the portal of entry. Skin or gastrointestinal routes are not the usual means by which diphtheria is acquired, though rare wound infections can occur, they are not the typical portal. So the statement that entry is through the respiratory tract best reflects the organism’s common route of infection.

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