Parvoviridae Overview and History

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Questions and Answers

What primary route does canine parvovirus take to infect a dog?

  • Oral ingestion
  • Oronasal route (correct)
  • Direct contact with infected surfaces
  • Inhalation of airborne particles

What supportive treatment is primarily given for canine parvoviral enteritis?

  • Intravenous fluids (correct)
  • Vaccine administration
  • Surgical intervention
  • Oral hydration therapy

Which of the following is NOT listed as a treatment for canine parvovirus?

  • Antibiotics
  • Antiemetics
  • Plasma transfusions
  • Antiviral medication (correct)

What does the acronym SMEDI stand for in the context of porcine parvovirus?

<p>Stillbirths, Mummified fetuses, Early embryonic death, Infertility (B)</p> Signup and view all the answers

What challenge does the high stability of the virus pose for disinfecting contaminated environments?

<p>It complicates disinfection efforts. (A)</p> Signup and view all the answers

At what age is vaccination against canine parvovirus generally recommended to begin?

<p>6-8 weeks (B)</p> Signup and view all the answers

Which of the following statements about maternal antibodies is correct?

<p>They interfere with vaccination. (D)</p> Signup and view all the answers

Which type of parvovirus is primarily responsible for reproductive issues in swine?

<p>Porcine parvovirus (B)</p> Signup and view all the answers

What is the primary impact of canine parvovirus on the affected dog's body?

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

What is a potential consequence of canine parvovirus infection that requires immediate attention?

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

What is the primary characteristic of parvoviruses regarding their structure?

<p>Non-enveloped and icosahedral (A)</p> Signup and view all the answers

Which viral genus belongs to the Parvoviridae family and is known for infecting vertebrates?

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

What is the size of the parvovirus genome?

<p>5.2 kbp (B)</p> Signup and view all the answers

Which disease was found to be caused by human parvovirus B19 in the early 1980s?

<p>Transient aplastic anemia (A)</p> Signup and view all the answers

What type of environment can parvoviruses withstand according to their stability characteristics?

<p>60C for 60 minutes at pH 3-9 (A)</p> Signup and view all the answers

Canine parvovirus is most notably associated with which of the following conditions?

<p>Viral enteritis and myocarditis (D)</p> Signup and view all the answers

Where does viral replication occur in parvoviruses?

<p>In the nucleus (A)</p> Signup and view all the answers

Which phase of the cell cycle do parvoviruses require for replication?

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

Which protein is primarily attributed to the properties of host species and tissue tropism in parvoviruses?

<p>VP2 (B)</p> Signup and view all the answers

Which subtype of parvovirus requires co-infection with an unrelated virus to produce infections?

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

Which of the following cells is most affected by Feline Panleukopenia Virus (FPV)?

<p>Epithelial cells of the intestine (B)</p> Signup and view all the answers

What is a common outcome of parvovirus infection in pregnant animals?

<p>Transplacental transmission leading to mummification (D)</p> Signup and view all the answers

In which decade was the canine parvovirus first observed?

<p>1970s (D)</p> Signup and view all the answers

What is a common environmental stability characteristic of parvoviruses?

<p>Extremely stable and heat resistant (D)</p> Signup and view all the answers

Which of the following diseases is NOT caused by parvoviruses?

<p>Rabies in dogs (A)</p> Signup and view all the answers

What defines the pathogenesis of parvovirus infections?

<p>Specific target cells (C)</p> Signup and view all the answers

What is the main reason Feline Panleukopenia Virus does not affect dogs?

<p>Dogs are not hosts for this virus (A)</p> Signup and view all the answers

Which disease is caused by Canine Parvovirus?

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

What is the entry mechanism for parvoviruses into host cells?

<p>Receptor-mediated endocytosis (C)</p> Signup and view all the answers

Which organism is NOT affected by Feline Panleukopenia Virus?

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

Flashcards

Parvoviridae

The family of viruses responsible for diseases like canine parvovirus, feline panleukopenia, and mink enteritis.

Parvovirus Virion

A small, non-enveloped virus with a 25 nm diameter, known for its stability in various environmental conditions.

Parvovirus Genome

The genetic material of Parvoviruses, composed of single-stranded DNA.

Parvovirus Proteins

Proteins produced by the Parvovirus, categorized as either structural or non-structural.

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Erythrovirus

A type of parvovirus that infects humans and primates, causing diseases like transient aplastic anemia.

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Dependovirus

A type of parvovirus that requires the presence of a helper virus, like an adenovirus, to replicate.

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VP2 Protein

A protein produced by Parvovirus, responsible for determining the host species and tissue tropism, receptor binding, and antigenic properties.

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Parvovirus Replication

The process where a virus penetrates its host's cells and starts to replicate.

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Tissue Tropism

The ability of a virus to infect specific types of cells or tissues within a host.

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Host Species Specificity

The property of a virus that determines its ability to infect certain species.

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Presumptive Diagnosis of Parvovirus

Clinical signs, hematological exam, and pathology findings can suggest parvovirus infection, but further testing is needed for confirmation.

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Canine Parvovirus Type 2

Canine parvovirus type 2 (CPV-2) causes severe intestinal damage leading to diarrhea and dehydration in dogs.

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Parvovirus Pathogenesis

Parvovirus enters through the mouth and nose, spreads to the lymph nodes, then to the bloodstream, eventually affecting the intestines, bone marrow, and heart.

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Treating Parvoviral Enteritis

Parvoviral enteritis has no cure. Treatment focuses on managing dehydration, infection, and vomiting.

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Treatment Options for Parvovirus

Intravenous fluids, electrolytes, plasma transfusions, antibiotics, anti-inflammatory drugs, and anti-emetics are used to treat parvovirus.

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Parvovirus Vaccination

Vaccination against parvovirus is essential for protecting dogs. Multiple doses are recommended for full immunity.

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Porcine Parvovirus

Porcine parvovirus causes a reproductive failure syndrome in pigs, resulting in stillbirths, mummified fetuses, early embryonic death, and infertility.

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SMEDI Syndrome

The symptoms of porcine parvovirus are grouped under the acronym SMEDI, representing stillbirths, mummified fetuses, early embryonic death, and infertility.

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Controlling Parvovirus Spread

High levels of virus shedding in feces make disinfection difficult. Vaccination, both live and killed, can help control the spread of porvovirus.

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Maternal Antibody Interference

Maternal antibodies can interfere with vaccination effectiveness, requiring a specific vaccination schedule.

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Parvovirus Disease

Parvoviruses are a group of viruses that require dividing cells for their replication, affecting various tissues and leading to specific disease symptoms. They can infect both animals and humans, leading to a range of diseases like feline distemper, canine parvovirus, and erythrocyte aplasia.

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Parvovirus Target Cells and Symptoms

Parvoviruses, like feline panleukopenia virus, infect and destroy actively dividing cells in different tissues, leading to specific disease symptoms. These symptoms vary depending on the affected tissue, and in kittens, infection can occur in the cerebellum, causing cerebellar hypoplasia and neurological problems.

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Parvovirus Replication Location

Parvovirus replication occurs inside the nucleus of the host cell. It requires dividing cells, as its replication process relies on the host cell's DNA replication.

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Parvovirus Entry Mechanism

Parvoviruses enter the host cell through a process called receptor-mediated endocytosis. This involves the virus binding to specific receptors on the cell's surface and then being taken inside the cell in a vesicle.

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Feline Panleukopenia Virus (FPV)

Feline panleukopenia virus (FPV) affects cats and related animals. It causes a variety of symptoms like fever, low white blood cell count (leukopenia), diarrhea, and potentially even death.

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FPV and Canine Parvovirus Similarity

Feline panleukopenia virus (FPV) has a very similar DNA sequence to canine parvovirus, but they affect different hosts. FPV infects cats, raccoons, and minks, while canine parvovirus affects dogs. Despite the similarities, they do not cause disease in each other's hosts.

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Canine Parvovirus Diseases

Canine parvovirus causes a range of diseases in dogs, including neonatal disease, enteritis (inflammation of the intestines), myocarditis (inflammation of the heart muscle), and leukopenia (low white blood cell count).

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Porcine Parvovirus (PPV)

Porcine parvovirus (PPV) is a virus that affects pigs. It is known for causing a syndrome called SMEDI (Stillbirth, Mummification, Embryonic death, and Infertility).

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Parvovirus Host Range and Pathogenicity

The genetic sequences within the capsid of the parvovirus determine which hosts it can infect and the severity of the resulting disease. This is known as host range and pathogenicity.

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Parvovirus Target Cells and Tissue Specific Disease

Infections with parvoviruses often target specific cell types or tissues, leading to various disease manifestations. For example, infection of the heart in puppies can lead to myocarditis, while infection of the cerebellum in kittens can cause cerebellar hypoplasia.

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Study Notes

Parvoviridae Overview

  • Parvoviruses are small, naked DNA viruses
  • Affect various animals, including cats, dogs, mink, and humans
  • Cause various diseases, including enteritis, panleukopenia, and myocarditis

Historical Discoveries

  • Early 1900s: Enteritis, panleukopenia, and cerebellar ataxia epidemics in cats
  • 1940s and 1960s: Similar syndromes in mink
  • 1960s: Identified as a family of small naked DNA viruses
  • 1965: Recognition of parvovirus as a separate virus
  • 1970s: New syndromes like viral enteritis and myocarditis in dogs
  • Early 1980s: Identified human parvovirus (B19) causing diseases like transient aplastic anemia

Classification

  • Parvoviridae family
    • Subfamily Parvovirinae
      • Parvovirus genus: minute virus of mice, canine parvovirus, porcine parvovirus, feline parvovirus, mink enteritis virus, duck parvovirus, bovine parvovirus
      • Dependovirus genus: adeno-associated virus (AAV), human & simian parvovirus
    • Subfamily Erythrovirus
      • Erythrovirus genus: human parvovirus (B19)

Virus Characteristics

  • Non-enveloped, icosahedral structure
  • Stable in environmental conditions (60°C for 60 minutes, pH 3-9)
  • 25 nm diameter
  • Requires dividing host cells to replicate (S phase)
  • Uses receptor-mediated endocytosis for entry

Viral Genome and Proteins

  • Linear, single-stranded DNA genome, 5.2 kbps
  • Non-structural proteins (NS1, NS2)
  • Structural proteins (VP1, VP2, VP3)
  • VP2 is important for host specificity, tropism, and receptor binding.

Diseases Caused by Parvoviruses

  • Feline panleukopenia: Generalized neonatal disease, cerebellar disease, and hypoplasia in cats

  • Canine parvovirus: Generalized neonatal disease, enteritis, myocarditis, and leukopenia in dogs

  • Porcine parvovirus: Reproductive failure syndrome in swine (SMEDI)

Canine Parvovirus

  • Emerged in the 1970s
  • Highly contagious virus
  • Damages intestines
  • Cause diarrhea, dehydration and can be fatal

Porcine Parvovirus

  • Major cause of reproductive failure in swine
  • Symptoms include stillbirths, mummified fetuses, early embryonic death, and infertility
  • Worldwide occurrence with variable prevalence rates

Viral Replication

  • Occurs in the nucleus
  • Needs dividing host cell

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