Therapeutic phages are being employed for vaccination and treatment of cancer and bacterial infections. Their natural immunogenicity triggers intertwined interactions with innate and adaptive immune cells that might influence therapy. Phage- and bactierial-derived pathogen-associated molecular patterns released after bacterial lysis have been proposed to stimulate local innate immune responses, which could promote antitumor immunity or bacterial clearance. Conversely, immunogenicity of phages induces phage-specific humoral memory, which can hamper therapeutic success. This review outlines the current knowledge on the different types of immune responses elicited by phages and their potential benefits and adverse side effects, when applied therapeutically. This review further summarizes the knowledge gaps and defines the key immunological questions that need to be addressed regarding the clinical application of antibacterial phage therapy.
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