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A strain is a subset of a bacterial species differing from other bacteria of the same species by some minor but identifiable difference.  
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A '''strain''' is a subset of a bacterial species differing from other bacteria of the same species by some minor but identifiable difference.  
    
A strain can also be defined as a population of organisms that descends from a single organism or pure culture isolate. Strains within a species may differ slightly from one another in many ways.  
 
A strain can also be defined as a population of organisms that descends from a single organism or pure culture isolate. Strains within a species may differ slightly from one another in many ways.  
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