Bacteriophages are parasitic to bacteria viruses . They are called the bacteria-eater viruses, bacteriophages. Bacteriophages, are existing in natural environments and are directly related to the numbers of bacteria present. They make significant impact on the evolution of bacteria.

Bacteriophages use to attach to their specific host  bacteria and to inject their genetic material (DNA) into the bacterial cell. The favorable hosting area enables bacteriophages' DNA to multiply itself. The process is followed by formation of many new bacteriophages, which cause cell burst. After loosing their host millions of bacteriophages are starting to chase their new specific host bacteria to complete their life cycle.

D’Herelle was the first who introduced  the use of phages for therapeutic treatment purposes against infectious bacterial diseases.  The preparations of bacteriophages have been used for treatment in the United States and, Eastern Europe  in the Soviet Union an in particular in Georgia

The bacteriophages were used in pediatric medicine, 1988		Intestibacteriophages were used as a preventive and treatment preparation, 1981		The use of bacteriophages during burns, 1981
Staphylophages against open wounds, 1988		Multy component pio-phages where often used, 1988		The use of bacteriophages during surgery, 1981

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The preparations were used for preventive and treatment measures in medicine, veterinary practice, water purification and disinfection.