Background: During the COVID-19 pandemic, several factors, such as improved hand hygiene, social distancing, and restricted hospital referral, may have had an influence on the epidemiology of... Show moreBackground: During the COVID-19 pandemic, several factors, such as improved hand hygiene, social distancing, and restricted hospital referral, may have had an influence on the epidemiology of Clostridioides difficile infections (CDI). Methods: The annual CDI incidence rate of nine hospitals participating in the Dutch sentinel CI surveillance with complete data was compared between 2020 and the previous five surveillance years. Trends in characteristics of hos-pitalised CDI patients in 21-24 participating hospitals were compared between the first (March 13-May 12, 2020) or second Dutch COVID-19 wave (September 17, 2020-January 1, 2021) and the same calendar periods in 2015 through 2019. All analyses were adjusted for trend changes over time. Findings: The annual CDI incidence rate in 2020 was lower compared to previous years. During the second wave, the percentage of CDI patients with severe CDI was higher compared to earlier (25.8% in 2020 vs 17.9% in 2015-2019 (RR 1.6; 95%CI 1.1-2.3)). After adjustment for delayed C. difficile diagnostics (>= 8 days from start symptoms), the increase disappeared. Delayed C. difficile diagnostics was indeed more common during the second wave (RR 1.7; 95%CI 1.1-2.6), but only for community-onset CDI (CO-CDI). Interpretation: This study shows that a higher percentage of severe CDI cases was observed during the second COVID-19 wave. This may partially be caused by delayed diagnostics, potentially due to decreased visits to a physi-cian or restricted hospital referral for CO-CDI patients. Funding Dutch ministry of Health. Copyright (C) 2022 The Authors. Published by Elsevier Ltd. Show less
Clostridium difficile infection (CDI) was discovered in 1978 as an important cause of antibiotic-associated diarrhoea. CDI became the most common healthcare-associated infection in Northern-America... Show moreClostridium difficile infection (CDI) was discovered in 1978 as an important cause of antibiotic-associated diarrhoea. CDI became the most common healthcare-associated infection in Northern-America and Europe during the antibiotic era, especially after global spread of a fluoroquinoloneresistant ribotype 027 strain in 2003. The rise of CDI urged the use of epidemiological surveillance systems to monitor disease dynamics and rapidly detect outbreaks. However, valid estimations of the infection burden of CDI in Europe were hampered by the heterogeneity and insufficiency of diagnostic algorithms for CDI, lack of standardised typing systems and incomplete surveillance methodologies. This thesis includes two studies conducted within a project named ‘the European CDI Surveillance Network’ focussing on enhancement of CDI surveillance and laboratory capacity for CDI in Europe. In the Netherlands, a sentinel surveillance system monitors the incidence of CDI in hospitals. This thesis describes (spatial) trends in the epidemiology of CDI in the Netherlands, in particular for children and the potentially zoonotic C. difficile ribotype 078. Data of a community-based case-control study was used to apply spatial scan statistics to detect CDI clustering beyond the hospital setting. Finally, this thesis provides directions for future epidemiological surveillance systems of CDI, both in the Netherlands and Europe. Show less
