[Increasing the effectiveness of the method of Staphylococcus phage-typing]

Area of Science:

• Microbiology
• Bacteriology

Context:

• Staphylococcus aureus phage-typing is crucial for epidemiological surveillance and strain identification.
• Standardization of nutrient media is essential for reproducible phage-typing results.

Purpose:

• To evaluate eight nutrient media for their efficacy in Staphylococcus aureus phage-typing.
• To identify the optimal solid nutrient medium for consistent and strong lytic reactions.

Summary:

• Eight nutrient media were tested using 22 known St. aureus strains and 44 foodborne isolates.
• Erythritol agar demonstrated superior performance, yielding the strongest lytic reactions with bacteriophages at the test dose (TD).
• Results on erythritol agar were comparable to Hottinger's medium, suggesting its suitability for unifying phage-typing methods.

Impact:

• Recommends the adoption of dry erythritol agar for standardized Staphylococcus aureus phage-typing.
• Proposes two cultivation procedures to enhance the percentage of cultures lysed by bacteriophages.
• Aims to improve the reliability and efficiency of Staphylococcal phage-typing for public health applications.