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Microbiology Exam 5 Study Guide – Nervous System Infections

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Q1. What is the central nervous system? What is the peripheral nervous system? What is cerebrospinal fluid?

Background

Topic: Human Nervous System Anatomy

This question tests your understanding of the basic structure and components of the nervous system, which is important for understanding how infections can affect these areas.

Key Terms:

  • Central Nervous System (CNS): The main control center of the body, including the brain and spinal cord.

  • Peripheral Nervous System (PNS): All nerves outside the CNS, connecting the CNS to limbs and organs.

  • Cerebrospinal Fluid (CSF): A clear fluid surrounding the brain and spinal cord, providing protection and nutrients.

Step-by-Step Guidance

  1. Start by identifying which organs are included in the CNS and which are part of the PNS.

  2. Describe the main function of the CNS and how it differs from the PNS.

  3. Explain what cerebrospinal fluid is, where it is found, and its role in the nervous system.

Try solving on your own before revealing the answer!

Final Answer:

The central nervous system (CNS) consists of the brain and spinal cord. The peripheral nervous system (PNS) includes all the nerves outside the CNS, connecting the CNS to the rest of the body. Cerebrospinal fluid (CSF) is a clear, colorless fluid that surrounds the brain and spinal cord, cushioning them and providing nutrients while removing waste.

Q2. Be able to define meningitis, encephalitis, and meningoencephalitis.

Background

Topic: Nervous System Infections

This question is about understanding the definitions of common infections of the nervous system, which is essential for recognizing symptoms and causes in microbiology.

Key Terms:

  • Meningitis: Inflammation of the protective membranes covering the brain and spinal cord (meninges).

  • Encephalitis: Inflammation of the brain itself.

  • Meningoencephalitis: Inflammation of both the brain and the meninges.

Step-by-Step Guidance

  1. Define each term by identifying which part of the nervous system is affected.

  2. Note the difference between inflammation of the meninges, the brain, or both.

  3. Think about how these conditions might present differently in a patient.

Try solving on your own before revealing the answer!

Final Answer:

Meningitis is inflammation of the meninges (the membranes covering the brain and spinal cord). Encephalitis is inflammation of the brain tissue itself. Meningoencephalitis is inflammation of both the brain and the meninges.

Q3. What is a spinal tap (lumbar puncture)?

Background

Topic: Diagnostic Procedures in Microbiology

This question tests your knowledge of a common medical procedure used to diagnose infections of the central nervous system.

Key Terms:

  • Spinal Tap (Lumbar Puncture): A procedure to collect cerebrospinal fluid for analysis.

Step-by-Step Guidance

  1. Describe where the procedure is performed (which part of the spine).

  2. Explain what is collected during the procedure and why.

  3. Discuss what kinds of diseases or infections this test can help diagnose.

Try solving on your own before revealing the answer!

Final Answer:

A spinal tap (lumbar puncture) is a procedure in which a needle is inserted into the lower back (lumbar region) to collect cerebrospinal fluid. This fluid is then analyzed to help diagnose infections like meningitis or other conditions affecting the central nervous system.

Q4. Which bacterial species causes tetanus? How does tetanus affect the human body?

Background

Topic: Bacterial Diseases of the Nervous System

This question focuses on the causative agent of tetanus and its effects on the body, which is important for understanding bacterial neurotoxins.

Key Terms:

  • Tetanus: A disease caused by a neurotoxin-producing bacterium.

  • Neurotoxin: A toxin that affects nerve cells.

Step-by-Step Guidance

  1. Identify the genus and species name of the bacterium responsible for tetanus.

  2. Describe how the bacterium enters the body (e.g., through wounds).

  3. Explain the effect of the tetanus toxin on the nervous system and muscles.

Try solving on your own before revealing the answer!

Final Answer:

Tetanus is caused by the bacterium Clostridium tetani. The bacterium produces a neurotoxin (tetanospasmin) that interferes with nerve signals, leading to severe muscle spasms and stiffness.

Q5. What bacterial species causes botulism? Is it an endotoxin or exotoxin? How does it relate to canned foods? What medical treatments involve injections of botox?

Background

Topic: Bacterial Neurotoxins and Foodborne Illness

This question tests your understanding of botulism, its causative agent, the type of toxin involved, and its relevance to food safety and medicine.

Key Terms and Concepts:

  • Botulism: A serious illness caused by a neurotoxin.

  • Exotoxin: A toxin secreted by bacteria into the surrounding environment.

  • Endotoxin: A toxin that is part of the bacterial cell wall, released when the cell dies.

  • Botox: A medical treatment using purified botulinum toxin.

Step-by-Step Guidance

  1. Identify the bacterium responsible for botulism (genus and species).

  2. Determine whether the toxin is an exotoxin or endotoxin, and explain the difference.

  3. Describe how improper canning can lead to botulism outbreaks.

  4. List some medical uses of botulinum toxin (Botox).

Try solving on your own before revealing the answer!

Final Answer:

Botulism is caused by Clostridium botulinum, which produces an exotoxin (botulinum toxin). The toxin can contaminate improperly canned foods, leading to illness if ingested. Botox, a purified form of the toxin, is used medically to treat muscle spasms, migraines, and for cosmetic procedures to reduce wrinkles.

Q6. What is the cause of Polio? How does the virus enter the human body? What caused the dramatic drop in Polio occurrences in the 1950s and 1960s?

Background

Topic: Viral Diseases of the Nervous System

This question covers the causative agent of polio, its transmission, and the impact of public health interventions.

Key Terms:

  • Poliovirus: The virus that causes polio.

  • Oral-fecal route: A common mode of transmission for enteric viruses.

  • Vaccine: A biological preparation that provides immunity to a disease.

Step-by-Step Guidance

  1. Identify the type of microbe that causes polio.

  2. Explain how the virus typically enters the human body.

  3. Discuss what major public health measure led to the decline in polio cases in the mid-20th century.

Try solving on your own before revealing the answer!

Final Answer:

Polio is caused by the poliovirus, which enters the body through the oral-fecal route (ingestion of contaminated water or food). The dramatic drop in polio cases in the 1950s and 1960s was due to the widespread use of polio vaccines.

Q7. How does the Rabies virus enter the human body? How does it affect the human body?

Background

Topic: Viral Zoonoses

This question focuses on the transmission and effects of the rabies virus, a classic example of a zoonotic infection affecting the nervous system.

Key Terms:

  • Rabies virus: A virus transmitted from animals to humans, often through bites.

  • Zoonosis: A disease that can be transmitted from animals to humans.

Step-by-Step Guidance

  1. Describe the most common way the rabies virus is transmitted to humans.

  2. Explain how the virus travels through the body after entry.

  3. Discuss the effects of rabies on the nervous system and symptoms in humans.

Try solving on your own before revealing the answer!

Final Answer:

The rabies virus usually enters the human body through the bite of an infected animal. It travels via peripheral nerves to the central nervous system, causing inflammation of the brain and leading to symptoms such as agitation, hydrophobia, and, if untreated, death.

Q8. What type of microbe is Cryptococcus neoformans? How does it enter the human body?

Background

Topic: Fungal Infections of the Nervous System

This question tests your knowledge of the classification and transmission of a fungal pathogen.

Key Terms:

  • Cryptococcus neoformans: A pathogenic fungus.

  • Inhalation: The process of breathing in, a common route for fungal spores to enter the body.

Step-by-Step Guidance

  1. Identify the kingdom or type of microbe (bacterium, virus, fungus, etc.).

  2. Describe the typical route of entry for this organism into the human body.

  3. Consider what environments or exposures might increase risk of infection.

Try solving on your own before revealing the answer!

Final Answer:

Cryptococcus neoformans is a fungus. It usually enters the human body through inhalation of airborne spores, often from soil contaminated with bird droppings.

Q9. What type of microbe is Trypanosoma brucei? How does it enter the human body?

Background

Topic: Protozoan Infections of the Nervous System

This question is about the classification and transmission of a protozoan pathogen responsible for African sleeping sickness.

Key Terms:

  • Trypanosoma brucei: A protozoan parasite.

  • Vector: An organism (often an insect) that transmits a pathogen.

Step-by-Step Guidance

  1. Identify the type of microbe (protozoan, bacterium, etc.).

  2. Describe the main route of transmission to humans (e.g., insect vector).

  3. Consider the disease caused by this organism and its geographic relevance.

Try solving on your own before revealing the answer!

Final Answer:

Trypanosoma brucei is a protozoan. It enters the human body through the bite of an infected tsetse fly, which acts as the vector for African sleeping sickness.

Q10. What type of microbe is Naegleria fowleri? How does it enter the human body? What does it do once inside of a person? Why should you use sterilized water in Neti pots?

Background

Topic: Protozoan Pathogens and Waterborne Infections

This question tests your understanding of a rare but deadly protozoan infection and the importance of water safety.

Key Terms:

  • Naegleria fowleri: A free-living protozoan (amoeba).

  • Primary Amoebic Meningoencephalitis (PAM): A severe brain infection caused by this organism.

  • Neti pot: A device used to rinse nasal passages.

Step-by-Step Guidance

  1. Identify the type of microbe Naegleria fowleri is.

  2. Describe how it typically enters the human body (e.g., through the nose during water activities).

  3. Explain what happens after it enters the body and why it is dangerous.

  4. Discuss why using sterilized water in Neti pots is important for preventing infection.

Try solving on your own before revealing the answer!

Final Answer:

Naegleria fowleri is a protozoan (amoeba). It enters the human body through the nose, usually when swimming in warm freshwater. Once inside, it travels to the brain and causes primary amoebic meningoencephalitis (PAM), which is almost always fatal. Using sterilized water in Neti pots prevents introducing the amoeba into the nasal passages.

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