Rabies and Borrelia Quiz

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Questions and Answers

What is the primary way rabies virus is transmitted to humans?

  • By the bite of an infected animal (correct)
  • Through contaminated water
  • By direct contact with infected blood
  • Through a mosquito bite

What characterizes the rabies virus genome?

  • Double-stranded DNA
  • Linear double-stranded RNA
  • Single-stranded RNA (correct)
  • Circular RNA

What is a required intervention after a potential rabies exposure?

  • Ignore symptoms and monitor for progress
  • Immediate isolation for 14 days
  • Immediate vaccination of the patient
  • Wash the wound and administer post-exposure prophylaxis (correct)

How does rabies virus travel to the brain after infection?

<p>Along peripheral nerves (C)</p> Signup and view all the answers

What preventative measure is recommended for at-risk individuals like vets and animal workers?

<p>Routine vaccination against rabies virus (B)</p> Signup and view all the answers

What primarily causes the secondary effects of Borrelia dissemination in the host?

<p>Immune system activation (A)</p> Signup and view all the answers

Which statement accurately describes Borrelia burgdorferi's interaction with its natural host?

<p>The immune system of the host has evolved to ignore Borrelia. (A)</p> Signup and view all the answers

What characteristic of Borrelia allows it to avoid the immune response in tissue?

<p>Rapid movement speed (C)</p> Signup and view all the answers

How might Gene Drives be utilized in relation to vector transmitted diseases?

<p>To reduce the burden of disease by altering vector populations (A)</p> Signup and view all the answers

What is a significant challenge in treating Borrelia infections?

<p>The immune system's failure to recognize Borrelia (B)</p> Signup and view all the answers

What is the main reason that rabies may be difficult to eradicate?

<p>Proliferation of the rabies virus in wild animal populations (D)</p> Signup and view all the answers

What percentage of dengue cases progress to severe dengue?

<p>A small proportion (B)</p> Signup and view all the answers

What viral disease is transmitted by an arthropod vector and has around 390 million infections annually?

<p>Dengue virus (B)</p> Signup and view all the answers

What is the fatality rate for dengue cases?

<p>1 in 2,000 (B)</p> Signup and view all the answers

Which factor contributes to the pathogenicity of Borrelia burgdorferi in Lyme disease?

<p>Motility enhancing transmission (A)</p> Signup and view all the answers

How many serotypes of the Dengue virus are known?

<p>Four (D)</p> Signup and view all the answers

What type of organism causes malaria?

<p>Protist (C)</p> Signup and view all the answers

In which age group do the majority of malaria deaths occur globally?

<p>Children under 5 years of age (A)</p> Signup and view all the answers

What is the primary method of transmission of Borrelia to humans in the Northeast US?

<p>Ixodes tick bite (B)</p> Signup and view all the answers

Which animals are considered primary reservoirs for Borrelia burgdorferi in the Northeast US?

<p>White-footed field mice and other small warm-blooded animals (A)</p> Signup and view all the answers

What stage of tick life contributes most significantly to the transmission of Lyme disease?

<p>Nymph stage (C)</p> Signup and view all the answers

What is one of the most common early symptoms of Lyme disease?

<p>Severe headache (A)</p> Signup and view all the answers

Which of the following is a virulence factor of Borrelia that helps it in evading the host's immune system?

<p>Outer surface proteins (OSP) (D)</p> Signup and view all the answers

What treatment is recommended for Lyme disease if diagnosed early?

<p>Oral antibiotics (B)</p> Signup and view all the answers

Which of these statements about Lyme disease is true?

<p>Lyme disease is the most prevalent vector-borne human disease in the US. (C)</p> Signup and view all the answers

Why are deer considered important in the life cycle of ticks transmitting Lyme disease?

<p>They serve as hosts for adult ticks. (A)</p> Signup and view all the answers

Flashcards

Vector-borne disease

A disease transmitted to humans through the bite of an arthropod, like an insect or tick. The vector itself is usually not severely affected by the disease.

Zoonotic disease

A disease that can spread from animals to humans.

Rabies virus

A virus that attacks the nervous system and can be fatal. Typically transmitted through the saliva of an infected animal.

Passive immunization

An antibody-based injection that provides immediate protection against rabies virus, often used after exposure to the virus.

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Rabies vaccine

A vaccine used to protect against rabies virus. It's typically used for high-risk groups like veterinarians and animal care workers.

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Negri bodies

Cytoplasmic inclusions found in nerve cells infected with rabies virus. They can be observed under a microscope and are characteristic of rabies infection.

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Rabies

A type of viral infection that attacks the central nervous system and is often fatal if not treated. It is typically transmitted through the saliva of an infected animal.

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Dengue fever

The most common type of arboviral infection, meaning it is transmitted by arthropod vectors like mosquitoes. It can cause a range of symptoms, from mild fever to severe dengue hemorrhagic fever.

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Dengue Hemorrhagic Fever (DHF)

A severe form of dengue fever characterized by bleeding, respiratory distress, and a dramatic drop in blood pressure. It can be life-threatening.

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Antibody-dependent enhancement (ADE)

A phenomenon that occurs when the immune system, after previously encountering one serotype of dengue virus, reacts more strongly to a different serotype upon subsequent infection. This can lead to more severe disease.

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Plasmodium

A protist (single-celled eukaryotic organism) that is the causative agent of malaria. It has a complex life cycle involving both humans and mosquitoes.

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Lyme disease

A bacterial infection caused by Borrelia burgdorferi, a spirochete bacterium. It is transmitted through the bite of infected ticks.

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How is Lyme disease mainly transmitted?

Lyme disease is primarily spread through the bite of infected blacklegged ticks, particularly in the Northeast US.

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What are common symptoms of early Lyme disease?

The initial stage of Lyme disease often features symptoms like headache, fever, fatigue, and sometimes a distinctive bullseye rash.

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What animals act as primary reservoirs for Lyme disease?

White-footed mice, along with other small mammals, serve as primary reservoirs for the bacteria that cause Lyme disease, while deer play a role in tick transportation.

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Why does the tick's life cycle contribute to the persistence of Lyme disease?

Ticks have a complex life cycle that requires three blood meals. They can acquire the Lyme bacteria during the first blood meal from an infected rodent.

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How do Lyme disease symptoms evolve over time?

Lyme disease symptoms can progress through three phases, from early flu-like symptoms to later-stage neurological issues, arthritis, and heart inflammation.

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How does Lyme bacteria evade the immune system?

Several bacteria surface proteins, called OSPs, help Lyme bacteria bind to host cells, and variations in these proteins make it difficult for our immune system to target.

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What is the typical treatment for Lyme disease?

Lyme disease cases are commonly treated with antibiotics like doxycycline or amoxicillin. Early treatment is crucial for a successful outcome.

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Why is Lyme disease considered an emerging disease?

While the exact reason for the increase of Lyme disease is complex, it's considered an emerging disease due to factors like the changing environment and human population distribution.

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Borrelia's mobility

Borrelia burgdorferi, the bacterium responsible for Lyme disease, is a sprinter in host tissue, moving quickly to evade immune cells.

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Host immune response to Borrelia

The immune system of rodents (natural hosts) is adapted to tolerate Borrelia without causing disease. Humans lack this adaptation, leading to noticeable symptoms.

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Lyme disease and immune response

Lyme disease symptoms are primarily caused by overactivation of the immune system, similar to autoimmune disorders like arthritis.

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Gene Drive

A new technology that uses genetically modified organisms to spread beneficial traits, potentially reducing the prevalence of vector-borne diseases like Lyme disease.

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Study Notes

Vector-Transmitted Diseases

  • Vector-borne diseases are transmitted to humans via the bite of an arthropod vector (like insects or ticks).
  • Rabies is a zoonotic disease, meaning it's transmitted from animals to humans, typically through saliva from a bite.
  • Rabies virus is an RNA virus (specifically, a (-)ssRNA).
  • The rabies virus replicates in nervous tissue, travels to the brain, and then is excreted in saliva.
  • Symptoms in humans develop slowly, often over months.
  • Post-exposure prophylaxis (PEP) involving human antibodies is crucial.
  • Rabies is a significant concern in wild animals.
  • Vaccinating domestic animals is a key control measure.
  • Oral rabies vaccines in baits can help target wild animals.
  • Many parts of the world are rabies-free.

Dengue Fever

  • Dengue is an arboviral disease transmitted by mosquitoes (Aedes mosquitoes specifically).
  • There are four known serotypes of Dengue virus.
  • Dengue fever is characterized by fever and symptoms like eye pain, muscle pain, headache, bone pain, nausea, vomiting, and rash.
  • Dengue hemorrhagic fever is a severe form, with additional bleeding, respiratory distress, and a sharp drop in blood pressure.
  • High rates of Dengue infections occur in tropical and subtropical regions.

Malaria

  • Malaria is a disease caused by the protist Plasmodium.
  • Plasmodium is transmitted by mosquitoes, typically Anopheles mosquitoes.
  • Malaria causes more than 600,000 deaths annually, mostly in children under 5.
  • Infection stages involve both the human and mosquito life cycle.

Lyme Disease

  • Lyme disease is caused by the bacterium Borrelia burgdorferi.
  • Borrelia is a spirochete (a spiral-shaped bacterium.)
  • Transmission is via the bite of infected ticks (Ixodes ticks, specifically).
  • The Northeast US has the highest incidence rates.
  • Humans are mostly infected by nymph ticks.
  • Important reservoir hosts include white-footed field mice and other small mammals.
  • Lyme disease is characterized by varying symptoms from early (headache, fever) to later stages (neurological issues, like Bell's palsy, arthritis, carditis).
  • Treatment often involves antibiotics.

General Info

  • Several vector-borne diseases are significant global health concerns and require constant surveillance and control efforts.

Antibody-Dependent Enhancement

  • Antibody-dependent enhancement (ADE) describes a phenomenon where antibodies can actually increase viral replication instead of neutralizing it.
  • ADE is a concern for dengue, where antibodies generated to one serotype can increase the risk of infection and a worse outcome by other serotypes.

Gene Drives

  • Gene drives are a promising tool to reduce the burden of vector-borne diseases.
  • Gene drive technology can selectively target and alter genes in a population, effectively reducing the transmission potential of diseases via specific vectors.

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