All of the following are true of Rocky Mountain spotted...

Name: Problem 6, Chapter 22: Nester's Microbiology: A Human Perspective
Uploaded: 2021-08-07T14:23:07-08:00
Duration: 1 min 51 s
Channel: Joanna Quigley
Description: All of the following are true of Rocky Mountain spotted fever except a) the disease is most prevalent in the western United States. b) it is caused by an obligate intracellular bacterium. c) it is a zoonosis transmitted to humans by ticks. d) those with the disease characteristically develop a hemorrhagic rash. e) antibiotic therapy is usually curative if given early in the disease.

All of the following are true of Rocky Mountain spotted fever except a) the disease is most prevalent in the western United States. b) it is caused by an obligate intracellular bacterium. c) it is a zoonosis transmitted to humans by ticks. d) those with the disease characteristically develop a hemorrhagic rash. e) antibiotic therapy is usually curative if given early in the disease.

All of the following are true of Rocky Mountain spotted fever
except
a) the disease is most prevalent in the western United States.
b) it is caused by an obligate intracellular bacterium.
c) it is a zoonosis transmitted to humans by ticks.
d) those with the disease characteristically develop a hemorrhagic rash.
e) antibiotic therapy is usually curative if given early in the disease.

Key Concepts

Rash Characteristics

Rash development in RMSF is a significant clinical feature, typically beginning as small, pink macules on the wrists and ankles before spreading centrally. The evolution of the rash does not characteristically include hemorrhagic lesions in its early or typical course, which is a common misconception.

Antibiotic Therapy

Early antibiotic therapy, particularly with doxycycline, is crucial and usually curative in treating RMSF. Prompt treatment is important to reduce the risk of severe complications, emphasizing the value of early clinical recognition and intervention in managing rickettsial infections.

Zoonosis and Tick Transmission

A zoonosis is a disease that can be transmitted from animals to humans. RMSF is a classic example because it is most commonly spread to humans through the bite of infected ticks, highlighting the importance of animal reservoirs and vector control in the prevention of such diseases.

Obligate Intracellular Bacterium

An obligate intracellular bacterium is one that can only reproduce within the cells of a host organism. In the context of RMSF, this refers to Rickettsia rickettsii, which requires the intracellular environment for survival and replication, making its disease process unique compared to extracellular pathogens.

Rocky Mountain Spotted Fever

Rocky Mountain spotted fever (RMSF) is an infectious disease caused by a bacterium transmitted by tick bites. The condition is notable for its systemic presentation and is part of the rickettsial diseases, which typically involve fever, headache, and rash after an incubation period following a tick bite.

Epidemiology

The epidemiological aspect of RMSF concerns its geographical distribution and prevalence. While historically associated with the Rocky Mountain region, the disease is more commonly reported in other parts of the United States, emphasizing that regional labels can sometimes be misleading.

Transcript

Please give Ace some feedback