 Bacteria phages have been shown to be effective in treating multidrug-resistant MDR bacteria. In this case study, a 41-year-old man suffering from Cartagena syndrome was treated with aerosolized phages targeted at his Pseudomonas originosa infection. The patient's condition improved significantly, with no further complications arising from the infection. Analysis of the bacterium showed it had developed resistance through multiple mechanisms, including spontaneous mutations and horizontal gene transfer. Despite this, the patient remained free of infection following phage treatment. This suggests that phage therapy can be used to treat MDR bacteria, even when complete eradication is not possible. This article was authored by Thilo Kola, Alexandra Lusher, Laina Falkenett, and others.