The Profile of Bacterial Infections in a Burn Unit during and after the COVID-19 Pandemic Period

Infections represent a major complication for burn-injured patients. The aim of this study was to highlight the changes in the incidence and antimicrobial resistance of bacterial strains isolated from burn patients, at the end of the COVID-19 pandemic, in relation to the antibiotics used during the pandemic. A comparative analysis of the demographic data and the microorganisms identified in the clinical samples of two groups of burn patients admitted to a university hospital in Romania was carried out. The first group consisted of 48 patients and the second of 69 patients, hospitalized in January-August 2020 and 2023, respectively. The bacterial species with the highest incidence were <i>S. aureus</i>, <i>A. baumannii</i>, <i>Pseudomonas</i> spp. The significant changes between 2023 and 2020 are reflected in the increase in the frequency of non-fermentative Gram-negative bacteria, especially <i>S. maltophilia</i>, and the increase in antimicrobial resistance of <i>Pseudomonas</i> and <i>Klebsiella</i> spp. <i>Klebsiella</i> spp. did not change in frequency (7%), but there was a significant increase in the incidence of <i>K. pneumoniae</i> strains with pan-drug resistant behaviour to antibiotics (40%), including colistin. The phenomenon can be explained by the selection of specimens carrying multiple resistance genes, as a result of antibiotic treatment during the COVID-19 period. The post-pandemic antimicrobial resistance detected in burn patients indicates the need for permanent surveillance of the resistance trends, primarily due to the limited therapeutic options available for these patients.