Related issues can include but are not limited to: phage delivery, phage therapy pharmacokinetics and pharmacodynamics (PK/PD), phage immunology, phage cocktail development, phage engineering, the noted phage-mediated biological control (of bacterial pathogens or other nuisance bacteria), phage–biofilm interactions, development of phage-based enzybiotics, phage co-treatments and interactions with other antibacterial agents such as antibiotics, aspects of phage–phage and phage–bacterium interactions that are important for therapeutic success, and in vitro, ex vivo, in silico, and in vivo models of phage therapy.