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Chapter 32: Neurologic Infections

Tabes dorsalis is a late complication of which systemic infection?

A. Syphilis

B. Lyme disease

C. Human immunodeficiency virus

D. Varicella zoster virus

A. Tabes dorsalis is a late complication of syphilis due to degeneration of posterior columns in the spinal cord. Symptoms include sensory disturbance as well as gait ataxia.

Which of the following arboviruses can cause meningoencephalitis?

A. West Nile virus

B. JC virus

C. St. Louis encephalitis virus

D. A and B

E. A and C

E. Arboviruses include West Nile virus, Japanese encephalitis, and St. Louis encephalitis. These require an insect vector for transmission. JC virus is not an arbovirus.

What is the characteristic imaging finding in neurocysticercosis?

A. Strokes in basal ganglia

B. Multiple small calcified lesions

C. Solitary mass-like lesions

D. None of the above

B. Multiple small calcified brain lesions are characteristic of neurocysticercosis and represent an inactive form of the parasite. Strokes in the basal ganglia are a common finding in CNS tuberculosis, or other infections causing vasculitis.

What is the mode of transmission for Lyme disease?

A. Mosquito bite

B. Airborne transmission

C. Tick bite

D. Ingestion of infected meat

C. In North America, Lyme disease is transmitted by the deer tick, Ixodes scapularis.

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