From year to year, the problem of multi-resistance of microorganisms against antibacterial drugs is becoming more acute, which in turn prompts pharmaceutical companies to search for new compounds that temporarily delay the approaching crisis, as evidenced by a large multi-center study [1]. Bacteriophages are a promising tool in the fight against multi-resistant infections, although the assertion of the powerful antibacterial properties of bacteriophages has caused controversy among the medical community, which has prompted the interest of the authors of this article in an in-depth study of this issue.