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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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[Hepatitis A virus epidemiology in 2007].

E Dussaix1, V Mackiewicz2, A-M Roque-Afonso1

  • 1Centre national des virus des hépatites à transmission entérique, AP-HP hôpital Paul-Brousse, Service de microbiologie, 94804 Villejuif, Université Paris-Sud, UMR-S 785, 94804 Villejuif.

Virologie (Montrouge, France)
|September 22, 2022
PubMed
Summary

Hepatitis A virus (HAV) infection is shifting to adults due to improved sanitation, increasing severe disease risk. Routine childhood vaccination could eradicate HAV, but is not recommended in high-incidence areas.

Keywords:
hepatitis Ahepatitis A virusincidenceseroprevalencevaccination against hepatitisA

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Area of Science:

  • Epidemiology
  • Infectious Diseases
  • Public Health

Context:

  • Improved sanitation globally has altered hepatitis A epidemiology.
  • Hepatitis A virus (HAV) transmission is shifting from children to adults.
  • Reduced HAV circulation paradoxically increases risk of severe disease and outbreaks.

Purpose:

  • To analyze the changing epidemiological patterns of hepatitis A.
  • To evaluate the role of vaccination in hepatitis A control.
  • To discuss vaccination recommendations based on incidence rates.

Summary:

  • Hepatitis A epidemiology is shifting towards adult populations due to improved hygiene.
  • Adults face higher risks of severe hepatitis A and outbreaks.
  • Vaccination is effective in reducing hepatitis A incidence.
  • Routine childhood vaccination could lead to HAV eradication.
  • Current recommendations exclude vaccination in high-incidence regions.

Impact:

  • Highlights the need for updated vaccination strategies for hepatitis A.
  • Informs public health policies regarding hepatitis A prevention.
  • Underscores the importance of considering age-specific incidence in vaccination programs.