Related Experiment Video
Updated: Jul 14, 2026

07:21
Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing
Published on: August 25, 2018
Ecological questions concerning rickettsiae
1Institute of Virology, Slovak Academy of Sciences, Bratislava, C.S.F.R.
European Journal of Epidemiology
|May 1, 1991
Summary
New spotted fever group rickettsioses emerge due to environmental changes and host interactions. Understanding these factors is crucial for predicting and managing emerging infectious diseases.
Area of Science:
- * Veterinary Medicine
- * Infectious Diseases
- * Environmental Science
Background:
- * Recent emergence of novel spotted fever group (SFG) rickettsioses (e.g., Israeli, Japanese, Astrakhan fevers).
- * Potential influence of industrial and agricultural chemicals on pathogen establishment and pathogenicity.
- * Role of abiotic (climate) and biotic (flora, fauna) factors in rickettsial agent circulation.
Purpose of the Study:
- * To explore factors contributing to the emergence of new SFG rickettsioses.
- * To investigate the impact of environmental and host-related changes on rickettsial pathogenicity.
- * To understand the complex interrelationships influencing rickettsial agent circulation.
Main Methods:
- * Review of recent epidemiological and ecological data on SFG rickettsioses.
- * Analysis of environmental factors (chemicals, climate) and their potential impact.
- * Consideration of host management practices (animal husbandry, migration) and their effects.
Main Results:
- * Environmental alterations, including chemical introductions, likely drive the emergence of new SFG rickettsioses.
- * Climate, flora, and fauna significantly influence the natural circulation of rickettsial agents.
- * Domestic animal management practices can alter the biological properties of pathogens like the Q fever agent.
- * Interactions with nonpathogenic rickettsiae and other microorganisms may affect pathogenic strains.
Conclusions:
- * Environmental modifications and host factors are key drivers for novel rickettsial diseases.
- * Understanding host-vector-pathogen dynamics is essential for predicting disease emergence.
- * Insights into rickettsial agent emergence and pathogenicity aid in forecasting infectious disease trends.
Related Concept Videos
Intracellular Movement of Viruses and Bacteria
Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a virus that...
Bacterial Phylum Chlamydiae
The phylum Chlamydiae or Chlamydiota is composed of a single order, Chlamydiales. This phylum consists entirely of obligate intracellular parasites that infect eukaryotic hosts. While human pathogens within this group have been studied extensively, the phylum encompasses many species capable of interacting with various eukaryotic organisms. Members of Chlamydiae are typically small cocci, approximately 0.5 μm in diameter, and exhibit a distinctive developmental cycle. As is characteristic of...
Bacterial Phylum Spirochaetes
Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased by a...
Diversity of Protists I
Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
Rocky Mountain Spotted Fever
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.
Rabies
Rabies is a lethal zoonotic disease caused by a single-stranded, negative-sense RNA virus of the Lyssavirus genus, within the family Rhabdoviridae. Its primary mode of transmission to humans is through bites or saliva-contaminated scratches from infected mammals such as dogs, bats, raccoons, or foxes. Transmission can also occur if infectious saliva contacts abraded skin or intact mucous membranes, including the conjunctiva.Viral Entry and Early ReplicationOnce introduced at the bite or scratch...

