Related Experiment Video
Updated: Aug 13, 2026
12:18
An Allelotyping PCR for Identifying Salmonella enterica serovars Enteritidis, Hadar, Heidelberg, and Typhimurium
Published on: July 22, 2011
[Salmonella possessing the 6,7:c:1,5 antigenic factors]
Annales De L'Institut Pasteur. Microbiologie
|September 1, 1985
Summary
Researchers classified 358 Salmonella strains based on biochemical traits and H:c antigen subfactors. Four distinct biovars were identified: Paratyphi C, Choleraesuis sensu stricto, Choleraesuis var. Kunzendorf, and Choleraesuis var. Decatur.
Area of Science:
- Microbiology
- Bacteriology
- Taxonomy
Context:
- Salmonella subspecies I strains with specific antigenic factors (6,7:c:1,5) were analyzed.
- Understanding Salmonella diversity is crucial for diagnostics and epidemiology.
Purpose:
- To classify Salmonella strains based on biochemical characteristics and H:c antigen subfactors.
- To establish reliable markers for differentiating Salmonella taxa.
Summary:
- 358 Salmonella strains were biochemically characterized, focusing on H:c antigen subfactors.
- Four homogeneous taxa (biovars) were identified using acid production from dulcitol and mucate, and H2S production.
- Arabinose and trehalose acid production were found to be unreliable markers for classification.
Impact:
- Establishes a clear taxonomic framework for specific Salmonella strains at the biovar level.
- Provides practical nomenclature for four distinct biovars: Paratyphi C, Choleraesuis sensu stricto, Choleraesuis var. Kunzendorf, and Choleraesuis var. Decatur.
- Aids in precise identification and differentiation of Salmonella serovars in research and clinical settings.
Related Concept Videos
01:19Formation of Lipopolysaccharides
Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
01:30Reservoir of Infection
Infectious diseases arise from intricate interactions between pathogens and their reservoirs. A reservoir of infection refers to the natural habitat where a pathogen lives, grows, and multiplies, serving as a continual source of infection. Reservoirs are broadly classified as either living or nonliving, and each plays a unique role in disease transmission, significantly influencing public health interventions and control strategies.Humans act as reservoirs for a wide array of pathogens,...
01:20Determinants of Bacterial Pathogenicity and Virulence
Pathogenic bacteria employ a variety of strategies to establish infections, including the secretion of extracellular enzymes that act as potent virulence factors. These enzymes facilitate bacterial colonization of host tissues and help evade immune surveillance. By targeting structural components of host tissues and interfering with immune mechanisms, these enzymes play a pivotal role in disease progression.Extracellular Enzymes Facilitating Tissue Invasion: Several bacterial pathogens secrete...
01:24Plague
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...
01:18Bacterial Gastroenteritis
Bacterial gastroenteritis, characterized by diarrhea, abdominal cramps, and vomiting, is often caused by ingestion of contaminated food or water and is frequently associated with pathogenic Escherichia coli strains. These microbes exploit two principal mechanisms to inflict disease.Shiga toxin–producing E. coli, also referred to as STEC—notably O157:H7—release Shiga toxins that target ribosomes, blocking protein synthesis. The B subunit of the toxin binds the host glycolipid receptor...
01:25Cholera
Cholera is an acute gastrointestinal disease caused by the Gram-negative bacterium Vibrio cholerae. It is transmitted primarily via the fecal-oral route through the ingestion of contaminated water or food.Vibrio cholerae is a motile, Gram-negative bacterium of the family Vibrionaceae, primarily associated with waterborne outbreaks in areas with inadequate sanitation. Although over 200 serogroups of V. cholerae exist, only O1 and O139 are responsible for epidemic cholera. The O1 serogroup,...