Model bacteriophages The following bacteriophages are extensively studied : 
In humans Although phage do not infect humans, there are countless phage particles in the human body, given our extensive microbiome. Our phage population has been called the human phageome, including the "healthy gut phageome" (HGP) and the "diseased human phageome" (DHP). The active phageome of a healthy human (i.e., actively replicating as opposed to nonreplicating, integrated prophage) has been estimated to comprise dozens to thousands of different viruses. The role of bacteriophage in human health remains poorly understood, but preliminary studies indicate that common bacteriophage are found on average in 62\% of healthy individuals, while their prevalence was reduced by 42\% and 54\% on average in patients with ulcerative colitis (UC) and Crohn’s disease (CD). This indicates that phage may be required to control the population of both normal and pathogenic bacteria in the human gut microbiome. Commonly studied bacteriophage Among the countless phage, only a few have been studied in detail, including some historically important phage that were discovered in the early days of microbial genetics. These, especially the T-phage, helped to discover important principles of gene structure and function.
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Model bacteriophages The following bacteriophages are extensively studied :
In humans Although phage do not infect humans, there are countless phage particles in the human body, given our extensive microbiome. Our phage population has been called the human phageome, including the "healthy gut phageome" (HGP) and the "diseased human phageome" (DHP). The active phageome of a healthy human (i.e., actively replicating as opposed to nonreplicating, integrated prophage) has been estimated to comprise dozens to thousands of different viruses. The role of bacteriophage in human health remains poorly understood, but preliminary studies indicate that common bacteriophage are found on average in 62\% of healthy individuals, while their prevalence was reduced by 42\% and 54\% on average in patients with ulcerative colitis (UC) and Crohn’s disease (CD). This indicates that phage may be required to control the population of both normal and pathogenic bacteria in the human gut microbiome.
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Commonly studied bacteriophage Among the countless phage, only a few have been studied in detail, including some historically important phage that were discovered in the early days of microbial genetics. These, especially the T-phage, helped to discover important principles of gene structure and function.