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Chickenpox is an acute, highly contagious disease caused by the varicella-zoster virus (VZV), a double-stranded DNA virus belonging to the Herpesviridae family. Its transmission occurs primarily through the inhalation of respiratory droplets or direct contact with vesicular fluid from skin lesions. The incubation period typically ranges from 10 to 21 days, during which the virus replicates and disseminates through sequential phases within the host. Although generally self-limiting in children,...
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Related Experiment Video

Updated: Jun 25, 2026

Influenza Virus Propagation in Embryonated Chicken Eggs
06:56

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Published on: March 19, 2015

Chicken anemia virus.

K A Schat1

  • 1Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA. kas24@cornell.edu

Current Topics in Microbiology and Immunology
|February 24, 2009
PubMed
Summary
This summary is machine-generated.

Chicken anemia virus (CAV) is a widespread chicken pathogen that can cause disease and immunosuppression, particularly in young or immunocompromised birds. This virus, belonging to the Gyrovirus genus, can remain latent in tissues.

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Area of Science:

  • Virology
  • Immunology

Background:

  • Chicken anemia virus (CAV) is a ubiquitous Gyrovirus within the Circoviridae family, found globally in chickens.
  • CAV shares similarities with Torque teno viruses (TTV, TTMV) but possesses a conserved genome and can be cultured in vitro.
  • Unlike TTV, CAV can induce clinical disease and immunosuppression, primarily targeting CD8+ T lymphocytes.

Purpose of the Study:

  • To detail the characteristics of Chicken anemia virus (CAV).
  • To compare CAV with Torque teno viruses (TTV, TTMV).
  • To elucidate the pathogenic potential and latency of CAV in chickens.

Main Methods:

  • Genomic analysis of CAV, highlighting its conserved nature.
  • Investigation of CAV's transcriptional regulation, including promoter-enhancer elements and transcription factors like COUP-TF1.
  • Examination of CAV's ability to establish latency in gonadal tissues.
  • Assessment of CAV's impact on the chicken immune system, focusing on CD8+ T lymphocytes.

Main Results:

  • CAV genome is highly conserved, contrasting with TTV.
  • A single polycistronic mRNA is translated into three proteins.
  • Estrogen enhances CAV transcription, while COUP-TF1 represses it.
  • CAV establishes latency in gonadal tissues, irrespective of antibody presence.
  • Clinical disease and immunosuppression, especially in CD8+ T cells, are observed.

Conclusions:

  • CAV is an important avian pathogen with unique biological and pathogenic features.
  • Its conserved genome, cell culture isolation, and latency potential distinguish it from related viruses.
  • CAV poses a significant threat to poultry health, causing disease and immune dysfunction, particularly in vulnerable chickens.