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Updated: Jun 29, 2026
Aseptic Laboratory Techniques: Plating Methods
Published on: May 11, 2012
Effect of various bacteriological media on the plaque morphology of Staphylococcus and Vibrio phages
Nachimuthu Ramesh1, Loganathan Archana1, Madhav Madurantakam Royam1
1Antibiotic Resistance and Phage Therapy Laboratory, School of Bio Science and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India.
Abstract:
The influence of media composition on the life cycle of bacteriophages to exhibit diverse plaque morphology on various bacteriological media was investigated by a double agar overlay method. Both Staphylococcus aureus phage and Vibrio parahaemolyticus phage showed altered plaque morphology from small to large and from clear to turbid, in different culture media used for the double agar overlay method.
Insights
Bacteriophage plaque morphology, including size and clarity, is significantly influenced by the composition of the bacteriological media used. This study investigated how different media affect bacteriophage life cycles and plaque characteristics.
Area of Science:
- Microbiology
- Virology
- Molecular Biology
Background:
- Bacteriophages are viruses that infect bacteria and are crucial in microbial ecosystems.
- Plaque morphology is a key characteristic used to identify and study bacteriophages.
- Understanding factors influencing plaque morphology is essential for phage research and application.
Purpose of the Study:
- To investigate the impact of different bacteriological media compositions on bacteriophage plaque morphology.
- To determine how media variations affect the life cycle and observable characteristics of bacteriophages.
Main Methods:
- The double agar overlay method was employed for plaque assays.
- Two specific bacteriophages, one infecting *Staphylococcus aureus* and another infecting *Vibrio parahaemolyticus*, were used.
- Plaque morphology was observed across various bacteriological media.
Main Results:
- Both *Staphylococcus aureus* phage and *Vibrio parahaemolyticus* phage exhibited altered plaque morphology.
- Changes in plaque morphology included variations in size (small to large) and turbidity (clear to turbid).
- These alterations were directly correlated with the different culture media utilized in the assay.
Conclusions:
- Bacteriological media composition is a critical factor influencing bacteriophage plaque morphology.
- Variations in media can lead to significant changes in the observable characteristics of bacteriophage plaques.
- This highlights the importance of standardized media for consistent bacteriophage characterization.
