Rickettsia rickettsii normally localizes in the

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Rickettsia rickettsii normally localizes in the

Rickettsia rickettsii targets the lining of small blood vessels. It invades and replicates within endothelial cells, causing inflammation of the vessel walls (vasculitis) and increased vascular permeability. This endothelial localization explains the vascular symptoms seen in Rocky Mountain spotted fever, such as edema and the characteristic petechial rash that arises from damage to the microvasculature. While other tissues like lymph nodes, brain, or lungs can become involved later due to vascular inflammation, the bacteria’s primary residence is the endothelial cells lining the blood vessels.

Rickettsia rickettsii targets the lining of small blood vessels. It invades and replicates within endothelial cells, causing inflammation of the vessel walls (vasculitis) and increased vascular permeability. This endothelial localization explains the vascular symptoms seen in Rocky Mountain spotted fever, such as edema and the characteristic petechial rash that arises from damage to the microvasculature. While other tissues like lymph nodes, brain, or lungs can become involved later due to vascular inflammation, the bacteria’s primary residence is the endothelial cells lining the blood vessels.

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