Related Experiment Video

Updated: Aug 26, 2026

An Electroporation Method to Transform Rickettsia spp. with a Fluorescent Protein-Expressing Shuttle Vector in Tick Cell Lines
07:18

An Electroporation Method to Transform Rickettsia spp. with a Fluorescent Protein-Expressing Shuttle Vector in Tick Cell Lines

Published on: October 11, 2022

Rickettsial disease: classical and modern aspects

M Rizzo1, P Mansueto, G Di Lorenzo

  • 1Department of Clinical Medicine and Emerging Diseases, University of Palermo, Italy.

The New Microbiologica
|February 18, 2004
PubMed

Insights

Rickettsial diseases are increasingly recognized in medicine, with new agents and distinct clinical patterns emerging globally. Understanding patient origin is crucial for diagnosing these evolving spotted fevers and other rickettsioses.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Public Health

Background:

  • Rickettsial diseases are gaining medical significance due to new discoveries.
  • Recent years have seen the description of novel rickettsial agents, some non-pathogenic and others causing distinct clinical syndromes.
  • Geographic distribution of rickettsiosis varies, with new species identified worldwide.

Purpose of the Study:

  • To reassess the current understanding of rickettsial diseases.
  • To highlight the emergence of new rickettsial agents and their clinical implications.
  • To emphasize the importance of geographical origin in patient diagnosis.

Main Methods:

  • Review of recent literature on rickettsial diseases.
  • Analysis of newly described rickettsial agents and their characteristics.
  • Epidemiological and clinical feature assessment of emerging rickettsioses.

Main Results:

  • Identification of novel pathogenic and non-pathogenic rickettsial agents.
  • Characterization of unique epidemiological and clinical features of new rickettsioses.
  • The group of spotted fevers shows significant recent developments.
  • Emerging rickettsioses present distinct entities, differing from older disease variants.

Conclusions:

  • Rickettsial diseases represent a dynamic field in medicine requiring ongoing reassessment.
  • New rickettsial agents and their associated diseases necessitate updated diagnostic and clinical approaches.
  • Investigating the geographical origin of patients is essential for routine medical practice in managing rickettsial diseases.

More Related Videos

Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing07:21

Tick Microbiome Characterization by Next-Generation 16S rRNA Amplicon Sequencing

Published on: August 25, 2018

Tick Artificial Membrane Feeding for Ixodes scapularis08:53

Tick Artificial Membrane Feeding for Ixodes scapularis

Published on: November 30, 2022

Related Concept Videos

Rocky Mountain Spotted Fever01:26

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.
Intracellular Movement of Viruses and Bacteria01:10

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...
Plague01:24

Plague

Plague is a highly virulent zoonotic disease caused by Yersinia pestis, a Gram-negative, facultatively anaerobic coccobacillus. This pathogen primarily circulates among rodent populations and is transmitted to humans through the bite of infected fleas. Additional transmission routes include direct contact with infected animal tissue or inhalation of respiratory droplets from individuals with pneumonic plague. These multiple transmission pathways highlight the bacterium’s potential for rapid...
Rabies01:28

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...
Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies01:22

Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies

The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
Bacterial Phylum Chlamydiae01:29

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...