| Summary: | Abstract. Bacteriophages, or viruses of microbes, when used as a medical strategy, might be able to solve the current crisis mankind faces with the increasing number of pathogens being antibiotic-resistant, where chemical drugs seized to show any therapeutic effect. The so-called phage therapy may be one of the most promising alternatives to treat infections caused by antibiotic-resistant bacteria, which are killed after infection by a phage. While phages that destroy the host by lysis are chosen for therapy, many pharmacological and immunological aspects of phages as medicines have not been established so far. The immune system plays an important role in a process called phage acceptance where both, innate and adaptive immune responses of the host are involved. However, not only medical aspects but also social ones such as lacking public awareness or acceptance, and lack of structured regulatory guidelines are challenges that have to be addressed in the near future to establish phage therapy as a reliable and safe alternative for the treatment of infections. This review focuses on the unique pharmacological and immunological aspects of phages used in therapy.
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