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Ch. 22 - Microbial Diseases of the Nervous System
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTortora 14th EditionCh. 22 - Microbial Diseases of the Nervous SystemProblema 3
Capitolo 18, Problema 3

A 12-year-old child hospitalized for Guillain-Barré syndrome had a 4-day history of headache, dizziness, fever, sore throat, and weakness of legs. Seizures began 2 weeks later. Bacterial cultures were negative. The child died 3 weeks after hospitalization. An autopsy revealed inclusions in brain cells that tested positive in an immunofluorescence test. This patient probably had
a. Rabies.
b. Creutzfeldt-Jakob disease.
c. Botulism.
d. Tetanus.
e. Leprosy.

Guida verificata passo dopo passo
1
Step 1: Analyze the clinical presentation and timeline. The child had symptoms including headache, dizziness, fever, sore throat, and leg weakness, followed by seizures two weeks later, and died three weeks after hospitalization. This suggests a progressive neurological disease.
Step 2: Note that bacterial cultures were negative, which helps exclude bacterial infections such as tetanus, botulism, and leprosy, which are caused by bacteria and often detectable by culture or clinical signs.
Step 3: Consider the autopsy findings: inclusions in brain cells that tested positive by immunofluorescence. This indicates the presence of viral antigens or proteins within neurons, which is characteristic of certain viral infections.
Step 4: Compare the options: rabies is a viral infection known for causing neuronal inclusions called Negri bodies, which are detectable by immunofluorescence. Creutzfeldt-Jakob disease is a prion disease and does not show viral inclusions. Botulism and tetanus are caused by bacterial toxins, and leprosy affects peripheral nerves but not brain cells with inclusions.
Step 5: Conclude that the most likely diagnosis is rabies, based on the clinical course, negative bacterial cultures, presence of neuronal inclusions, and positive immunofluorescence test.

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Guillain-Barré Syndrome and Its Clinical Context

Guillain-Barré syndrome (GBS) is an acute autoimmune disorder causing rapid muscle weakness due to peripheral nerve inflammation. It often follows infections and can present with symptoms like weakness and sensory disturbances. Understanding GBS helps differentiate primary neurological autoimmune conditions from infectious causes of neurological symptoms.
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03:05
Prions

Viral Encephalitis and Brain Cell Inclusions

Certain viral infections cause encephalitis characterized by brain cell inclusions visible on autopsy. Immunofluorescence tests detect viral antigens in these inclusions, aiding diagnosis. Recognizing the significance of viral inclusions helps identify infections like rabies, which produce characteristic Negri bodies in neurons.
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Cell Inclusions

Differential Diagnosis of Neurological Infectious Diseases

Neurological infections such as rabies, Creutzfeldt-Jakob disease, botulism, tetanus, and leprosy have distinct pathologies and clinical features. Rabies causes encephalitis with Negri bodies; Creutzfeldt-Jakob is a prion disease; botulism and tetanus are toxin-mediated; leprosy affects peripheral nerves. Differentiating these is key to accurate diagnosis.
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Intro to Characteristics of Infectious Disease
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After receiving a corneal transplant, a patient developed dementia and loss of motor function, then became comatose and died. Cultures were negative. Serological tests were negative. Autopsy revealed spongiform degeneration of brain tissue. The patient most likely had

a. Rabies.

b. Creutzfeldt-Jakob disease.

c. Botulism.

d. Tetanus.

e. Leprosy.

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