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Rocky Mountain Spotted Fever (RMSF) is a severe tick-borne illness caused by Rickettsia rickettsii, a Gram-negative, coccobacillary bacterium. This pathogen is an obligate intracellular parasite, requiring a host cell for replication. Transmission occurs through the bite of an infected tick. In the United States, the most important vectors are Dermacentor variabilis (American dog tick) and Dermacentor andersoni (Rocky Mountain wood tick), though other tick species may also serve as vectors.
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Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...
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Related Experiment Video

Updated: Jun 4, 2026

Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy
09:13

Using Reverse Genetics to Manipulate the NSs Gene of the Rift Valley Fever Virus MP-12 Strain to Improve Vaccine Safety and Efficacy

Published on: November 1, 2011

[Rift Valley fever].

M Pépin1,

  • 1VetAgroSup - Campus vétérinaire de Lyon, 1, avenue Bourgelat, 69280 Marcy-l'Étoile, France. m.pepin@vetagro-sup.fr

Medecine Et Maladies Infectieuses
|February 8, 2011
PubMed
Summary
This summary is machine-generated.

Rift Valley Fever (RVF) is a zoonotic disease affecting animals and humans. Global spread and climate change raise concerns about RVF virus emergence in new regions.

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Area of Science:

  • Veterinary Medicine
  • Epidemiology
  • Virology

Context:

  • Rift Valley Fever (RVF) is a zoonotic arbovirosis primarily affecting ruminants, causing significant economic losses through abortions and mortality.
  • RVF virus, identified in Kenya in the 1930s, has spread across Africa and into the Middle East, with recent outbreaks in Eastern Africa, Comoros, and Mayotte.
  • The virus's potential for global spread, facilitated by vectors and high viral loads in animals, poses a threat to temperate climates.

Purpose:

  • To highlight the global spread and potential emergence of Rift Valley Fever (RVF) virus.
  • To inform about the risks associated with RVF virus transmission and its impact on animal and human health.
  • To emphasize the need for preparedness in RVF-free countries due to climate change and vector distribution.

Summary:

  • Rift Valley Fever (RVF) is a zoonotic arbovirus with significant impacts on ruminants and humans.
  • The virus has a history of epizootics/epidemics in Africa and has spread to the Middle East and islands in the Indian Ocean.
  • Global spread, climate change, and vector competence raise concerns about RVF emergence in temperate regions, necessitating increased preparedness.

Impact:

  • Increased global awareness and preparedness for potential Rift Valley Fever (RVF) outbreaks in previously unaffected regions.
  • Understanding the epidemiological dynamics of RVF virus spread and its implications for public and animal health.
  • Highlighting the role of climate change in altering vector distribution and competence, influencing the geographic range of arboviruses like RVF.