Impact of COVID-19 on healthcare associated infections and antimicrobial use in Italy, 2022

Introduction We aimed to assess the impact of COVID-19 on healthcare associated infection (HAI) transmission and antimicrobial use (AMU) prevalence during the later stages of the pandemic. Methods A point prevalence survey (PPS) was conducted among 325 acute-care hospitals of 19/21 regions of Italy, during November 2022. Non COVID-19 patients were matched to COVID-19 patients according to age, sex, and severity of underlying conditions. HAI and AMU prevalence were calculated as the percentage of patients with at least one HAI or prescribed at least one antimicrobial over all included patients, respectively. Results In total, 60403 patients were included, 1897 (3.14%) of which were classified as COVID-19 patients. Crude HAI prevalence was significantly higher among COVID-19 patients compared to non COVID-19 patients (9.54% vs. 8.01%, prevalence rate ratio, PRR 1.19, 95% confidence interval, CI 1.04–1.38, p<0.05), and remained higher in the matched sample, however statistical significance was not maintained: odds ratio (OR) 1.25 (95% CI 0.99 – 1.59, p 0.067). AMU prevalence was significantly higher among COVID-19 patients prior to matching (46.39% vs. 41.52%, PRR 1.21, 95% CI 1.11-1.32, p<0.001), and significantly lower after matching: OR 0.77 (95% CI 0.66-0.89, p < 0.001). Conclusions COVID-19 patients could be at higher HAI risk due to underlying clinical conditions and to the intensity of healthcare needs. Further efforts should be dedicated to antimicrobial stewardship among COVID-19 patients.