Rickettsial infections characteristically invade which cells, leading to vasculitis and a petechial rash?

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Prepare for the NBME Microbiology Test. Study with flashcards and multiple-choice questions. Each query comes with hints and detailed explanations. Ace your exam!

Multiple Choice

Rickettsial infections characteristically invade which cells, leading to vasculitis and a petechial rash?

Explanation:
Rickettsial infections target vascular endothelium. These bacteria invade endothelial cells lining small blood vessels and multiply there, causing endothelial injury and vasculitis. This inflammation and damage to the vessel walls lead to leakage and microhemorrhages, producing the petechial rash that is characteristic of these infections. The other cell types listed are not the usual hosts for rickettsiae—neurons, lymphocytes, and erythrocytes do not serve as primary invasion targets—so the endothelium best explains the vasculitis and rash seen in these diseases.

Rickettsial infections target vascular endothelium. These bacteria invade endothelial cells lining small blood vessels and multiply there, causing endothelial injury and vasculitis. This inflammation and damage to the vessel walls lead to leakage and microhemorrhages, producing the petechial rash that is characteristic of these infections. The other cell types listed are not the usual hosts for rickettsiae—neurons, lymphocytes, and erythrocytes do not serve as primary invasion targets—so the endothelium best explains the vasculitis and rash seen in these diseases.

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