The portal of entry for the diphtheria agent is

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The portal of entry for the diphtheria agent is

Diphtheria enters mainly through the respiratory mucosa. When an infected person coughs or sneezes, droplets containing Corynebacterium diphtheriae are inhaled, allowing the bacteria to colonize the mucous membranes of the nose and throat (the pharynx and nasopharynx). This upper airway site serves as the portal of entry, which is why the mouth and nose are the correct choice. The bacteria can produce diphtheria toxin there, causing local tissue damage and the characteristic pseudomembrane, with potential systemic effects as the toxin disseminates. While skin or conjunctival exposure can occur in rare forms, and the toxin can affect distant organs, the classic entry point is the respiratory tract via the mouth and nose.

Diphtheria enters mainly through the respiratory mucosa. When an infected person coughs or sneezes, droplets containing Corynebacterium diphtheriae are inhaled, allowing the bacteria to colonize the mucous membranes of the nose and throat (the pharynx and nasopharynx). This upper airway site serves as the portal of entry, which is why the mouth and nose are the correct choice. The bacteria can produce diphtheria toxin there, causing local tissue damage and the characteristic pseudomembrane, with potential systemic effects as the toxin disseminates. While skin or conjunctival exposure can occur in rare forms, and the toxin can affect distant organs, the classic entry point is the respiratory tract via the mouth and nose.

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