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Final answer:

Phage-typing of bacterial strains is a technique used to identify and classify bacteria based on their susceptibility to bacteriophages. It provides valuable information about the relatedness and distribution of bacterial strains, helping track outbreaks and antibiotic resistance. Phage-typing is an important tool for understanding genetic diversity and characterizing disease-causing bacteria.

Explanation:

Phage-typing of bacterial strains is a technique used to identify and classify bacterial strains based on their susceptibility to specific bacteriophages. Bacteriophages are viruses that infect and replicate within bacteria. By exposing bacterial strains to different phages and observing their ability to support phage replication, scientists can determine the specific phage groups to which the bacteria belong.

Phage-typing is commonly used in epidemiological studies and can provide valuable information about the relatedness and distribution of bacterial strains. For example, it can help identify outbreaks of bacterial infections and track the spread of antibiotic-resistant strains.

Overall, phage-typing is an important tool for understanding the genetic diversity and relationships among bacterial strains and is particularly useful for identifying and characterizing strains of certain bacteria that may cause human illnesses.

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