Related Experiment Video
Updated: Jun 20, 2026
09:39
A Platform of Anti-biofilm Assays Suited to the Exploration of Natural Compound Libraries
Published on: December 27, 2016
Bacterial biofilm formation, pathogenicity, diagnostics and control: An overview
Rajesh Sawhney1, Vandana Berry
1Department of Applied Biology, Hawassa University, Ethiopia. sawhneyrajesh@yahoo.com
Indian Journal of Medical Sciences
|August 25, 2009
Summary
Bacterial biofilms are microbial communities that cause infections and are hard to diagnose. New, rapid diagnostic methods are needed for better biofilm detection and control.
Area of Science:
- Microbiology
- Infectious Diseases
Background:
- Bacterial biofilms are microbial communities that adhere to surfaces, acting as a survival mechanism.
- Biofilm formation involves mechanical, biochemical, and genetic factors, enhancing pathogen virulence in infections like cystic fibrosis and urinary tract infections.
Purpose of the Study:
- To review current diagnostic techniques for bacterial biofilms.
- To highlight the need for improved, rapid, and precise diagnostic protocols for biofilm detection and evaluation.
Main Methods:
- Review of existing diagnostic techniques including microscopy (bright-field, epifluorescence, scanning electron, confocal laser scanning) and molecular methods (amplicon length heterogeneity polymerase chain reaction).
- Discussion of various biofilm control strategies such as catheter lock solutions, fish protein coatings, acid shock, and bacteriophages.
Main Results:
- Current diagnostic techniques for biofilms vary in precision and speed.
- Existing biofilm control methods show potential but require further research and development.
Conclusions:
- Accurate and rapid diagnostic protocols are crucial for effective biofilm detection and management.
- Stricter adherence to diagnostic techniques is necessary for precise diagnosis and control of biofilm-related infections.
Related Concept Videos
01:29Biofilms
Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
01:25Colonisation 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...
01:30Bacterial Signaling
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
01:28Biological Methods for Microbial Control
Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
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...
01:28Gene Regulation in Microbial Communities: Quorum Sensing
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...