Surge of Pediatric Respiratory Tract Infections After the COVID-19 Pandemic and the Concept of "Immune Debt".

Objective: To investigate a dose-response relationship between the magnitude of decrease in pediatric respiratory tract infections (RTI) during the 2020 implementation of non-pharmaceutical interventions (NPI) and the rise thereafter during NPI lifting.

Study Design: We conducted an interrupted, time-series analysis, based on a multinational surveillance system. All patients <16 years of age coming to medical attention with various symptoms and signs of RTI at 25 pediatric emergency departments from 13 European countries between January 2018 and June 2022 were included.

BRAF-mutated serrated colorectal neoplasia drives transcriptional activation of cholesterol metabolism.

BRAF mutations occur early in serrated colorectal cancers, but their long-term influence on tissue homeostasis is poorly characterized. We investigated the impact of short-term (3 days) and long-term (6 months) expression of Braf in the intestinal tissue of an inducible mouse model. We show that Braf perturbs the homeostasis of intestinal epithelial cells, with impaired differentiation of enterocytes emerging after prolonged expression of the oncogene.

Monitoring of the microcirculation in children undergoing major abdominal and thoracic surgery: A pilot study.

Background: Monitoring of the macrocirculation during surgery provides limited information on the quality of organ perfusion.

Objective: We investigated the feasibility of perioperative microcirculatory measurements in children.

Methods: Sublingual microvessels were visualized by handheld videomicroscopy in 11 children (19 mo - 10 yrs) undergoing surgery > 120 min at four time points: T0) after induction of anesthesia; T1) before end of anesthesia, T2) 6 h post surgery and T3) 24 h post surgery.

Respective roles of non-pharmaceutical interventions in bronchiolitis outbreaks: an interrupted time-series analysis based on a multinational surveillance system.

Background: Bronchiolitis is a major source of morbimortality among young children worldwide. Non-pharmaceutical interventions (NPIs) implemented to reduce the spread of severe acute respiratory syndrome coronavirus 2 may have had an important impact on bronchiolitis outbreaks, as well as major societal consequences. Discriminating between their respective impacts would help define optimal public health strategies against bronchiolitis.

Presentations of children to emergency departments across Europe and the COVID-19 pandemic: A multinational observational study.

Background: During the initial phase of the Coronavirus Disease 2019 (COVID-19) pandemic, reduced numbers of acutely ill or injured children presented to emergency departments (EDs). Concerns were raised about the potential for delayed and more severe presentations and an increase in diagnoses such as diabetic ketoacidosis and mental health issues. This multinational observational study aimed to study the number of children presenting to EDs across Europe during the early COVID-19 pandemic and factors influencing this and to investigate changes in severity of illness and diagnoses.