Epidemiology of Acute Myocarditis/Pericarditis in Hong Kong Adolescents Following Comirnaty Vaccination.

Background: Age-specific incidence of acute myocarditis/pericarditis in adolescents following Comirnaty vaccination in Asia is lacking. This study aimed to study the clinical characteristics and incidence of acute myocarditis/pericarditis among Hong Kong adolescents following Comirnaty vaccination.

Methods: This is a population cohort study in Hong Kong that monitored adverse events following immunization through a pharmacovigilance system for coronavirus disease 2019 (COVID-19) vaccines.

Erratum: Erratum: Encephalopathy and Responsiveness to Pyridoxal-5'-Phosphate.

[This corrects the article DOI: 10.1055/s-0040-1721384.].

Clinical Characteristics and Transmission of COVID-19 in Children and Youths During 3 Waves of Outbreaks in Hong Kong.

Importance: Schools were closed intermittently across Hong Kong to control the COVID-19 outbreak, which led to significant physical and psychosocial problems among children and youths.

Objective: To compare the clinical characteristics and sources of infection among children and youths with COVID-19 during the 3 waves of outbreaks in Hong Kong in 2020.

Design, Setting, And Participants: This cross-sectional study involved children and youths aged 18 years or younger with COVID-19 in the 3 waves of outbreaks from January 23 through December 2, 2020.

Encephalopathy and Responsiveness to Pyridoxal-5'-Phosphate.

mutations encompass a wide range of phenotypes, ranging from benign familial neonatal seizure to a clinical spectrum of early-onset epileptic encephalopathy that occurs in the early neonatal period. We report an infant with encephalopathy presenting as neonatal seizure, initially controlled by two anticonvulsants. Electroencephalogram (EEG) showed repetitive multifocal epileptiform discharges, which remained similar after administration of intravenous pyridoxine injection.

Presentation and Outcome of Acute Necrotizing Encephalopathy of Childhood: A 10-Year Single-Center Retrospective Study From Hong Kong.

Acute necrotizing encephalopathy (ANE) is a rare disease in childhood. We reviewed the 10-year data from a local pediatric department, reported the clinical characteristics, laboratory tests, neuroimaging findings, and outcome of the acute necrotizing encephalopathy cases and identified the potential factors affecting the outcome. Eight episodes of acute necrotizing encephalopathy among 7 patients were recorded, in which all of them had an initial presentation of fever and seizure.