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Related Concept Videos

Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
Determinants of Bacterial Pathogenicity and Virulence01:20

Determinants 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...
Bacterial Phylum Spirochaetes01:30

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...
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Colonisation of Pathogens01:25

Colonisation of Pathogens

Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...

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Related Experiment Video

Updated: Jul 7, 2026

Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells
15:29

Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells

Published on: August 5, 2016

Brucella: a pathogen without classic virulence genes.

Mohamed N Seleem1, Stephen M Boyle, Nammalwar Sriranganathan

  • 1Institute for Critical Technology and Applied Science, Center for Molecular Medicine and Infectious Diseases, Virginia-Maryland Regional College of Veterinary Medicine, Virginia Polytechnic and State University, VA 24061, United States.

Veterinary Microbiology
|January 30, 2008
PubMed
Summary
This summary is machine-generated.

Brucella bacteria are difficult to study due to their lack of classical virulence factors. This review examines known and potential virulence genes contributing to Brucella

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Tractable Mammalian Cell Infections with Protozoan-primed Bacteria
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Last Updated: Jul 7, 2026

Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells
15:29

Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells

Published on: August 5, 2016

Tractable Mammalian Cell Infections with Protozoan-primed Bacteria
13:54

Tractable Mammalian Cell Infections with Protozoan-primed Bacteria

Published on: April 2, 2013

Area of Science:

  • Microbiology
  • Bacteriology
  • Pathogen-host interactions

Background:

  • Brucella, a bacterial pathogen, has been studied for over a century, with genomic sequences now available.
  • Despite extensive research, the factors enabling Brucella's persistence and intracellular multiplication within host phagocytic cells remain poorly understood.
  • Key aspects of Brucella-host interactions and the pathogen's survival mechanisms require further elucidation.

Purpose of the Study:

  • To review and analyze the known and putative virulence factors of Brucella.
  • To elucidate the molecular mechanisms underlying Brucella's intracellular survival and chronic infection establishment.
  • To provide insights for developing effective prevention and control strategies against Brucella infections.

Main Methods:

  • Review of existing literature on Brucella virulence factors and intracellular survival mechanisms.
  • Analysis of studies involving gene disruption and attenuation assays in cell lines and animal models.
  • Examination of genomic data and molecular characterization of Brucella pathogenesis.

Main Results:

  • Brucella lacks classical virulence factors, making identification challenging.
  • Many identified virulence factors are putative, and their roles in pathogenesis are not always clear.
  • Gene redundancy and compensatory mechanisms can complicate the study of Brucella virulence.

Conclusions:

  • Understanding Brucella's virulence factors and intracellular survival mechanisms is crucial for disease control.
  • Further research is needed to definitively identify virulence factors and their precise roles.
  • Molecular characterization of Brucella pathogenesis will guide the development of targeted interventions.