tetano
Editor, Senior Moderator
Open Forum Infect Dis
. 2026 Mar 11;13(3)
fag131.
doi: 10.1093/ofid/ofag131. eCollection 2026 Mar.
Outcome of and Risk Factors for Mortality in Pediatric Coronavirus Disease 2019 Encephalitis During the 2022 Omicron Wave in Taiwan: A National Retrospective Study
Pei-Jiuan Chao[SUP] 1 [/SUP], Wan-Chin Chen[SUP] 2 [/SUP], Angela Song-En Huang[SUP] 1 [/SUP], Chia-Ping Su[SUP] 3 4 [/SUP]
Affiliations
Background: During Taiwan's severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron outbreak in 2022, pediatric coronavirus disease 2019 (COVID-19) encephalitis cases surged, resulting in multiple fatalities. We investigated patient characteristics and mortality risk factors.
Method: Using the Brighton Collaboration criteria, we identified 289 suspected pediatric COVID-19 encephalitis cases diagnosed between April and December 2022 by linking the national surveillance, remdesivir application, immunization, and death registries. We analyzed clinical data and viral genotypes, then used univariate and multivariate logistic regressions to assess mortality risk factors.
Results: We identified 75 encephalitis cases: 50 (67%) were male, with a median age of 5 years (interquartile range [IQR]: 3-8 years), 45 (60%) had no comorbidities, and 23 (31%) had received at least 1 dose of the COVID-19 vaccine. The median interval from symptom onset to medical attention was <1 day (IQR: 0-1 day).Fourteen cases (19%) died after a median hospital stay of 3 days (IQR: 1-5 days). All sequenced viruses matched the circulating Omicron subvariants. In univariate analysis, age <5 years was associated with increased mortality (odds ratio [OR] & 6.05; 95% confidence interval [CI] & 1.53-24.00). Multivariate analysis showed a nonsignificant trend (adjusted OR & 3.64; 95% CI & 0.81-16.40) after adjustment for sex, comorbidities, and vaccination.
Conclusions: During the Omicron wave, the number of pediatric COVID-19 encephalitis cases progressed rapidly and mortality was high, particularly among children <5 years of age, regardless of comorbidities. We recommend COVID-19 vaccination and monitoring for signs of COVID-19 encephalitis in young children.
Keywords: COVID-19; SARS-CoV-2; encephalitis; omicron; pediatric.
. 2026 Mar 11;13(3)
fag131.doi: 10.1093/ofid/ofag131. eCollection 2026 Mar.
Outcome of and Risk Factors for Mortality in Pediatric Coronavirus Disease 2019 Encephalitis During the 2022 Omicron Wave in Taiwan: A National Retrospective Study
Pei-Jiuan Chao[SUP] 1 [/SUP], Wan-Chin Chen[SUP] 2 [/SUP], Angela Song-En Huang[SUP] 1 [/SUP], Chia-Ping Su[SUP] 3 4 [/SUP]
Affiliations
- PMID: 41889454
- PMCID: PMC13014466
- DOI: 10.1093/ofid/ofag131
Background: During Taiwan's severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron outbreak in 2022, pediatric coronavirus disease 2019 (COVID-19) encephalitis cases surged, resulting in multiple fatalities. We investigated patient characteristics and mortality risk factors.
Method: Using the Brighton Collaboration criteria, we identified 289 suspected pediatric COVID-19 encephalitis cases diagnosed between April and December 2022 by linking the national surveillance, remdesivir application, immunization, and death registries. We analyzed clinical data and viral genotypes, then used univariate and multivariate logistic regressions to assess mortality risk factors.
Results: We identified 75 encephalitis cases: 50 (67%) were male, with a median age of 5 years (interquartile range [IQR]: 3-8 years), 45 (60%) had no comorbidities, and 23 (31%) had received at least 1 dose of the COVID-19 vaccine. The median interval from symptom onset to medical attention was <1 day (IQR: 0-1 day).Fourteen cases (19%) died after a median hospital stay of 3 days (IQR: 1-5 days). All sequenced viruses matched the circulating Omicron subvariants. In univariate analysis, age <5 years was associated with increased mortality (odds ratio [OR] & 6.05; 95% confidence interval [CI] & 1.53-24.00). Multivariate analysis showed a nonsignificant trend (adjusted OR & 3.64; 95% CI & 0.81-16.40) after adjustment for sex, comorbidities, and vaccination.
Conclusions: During the Omicron wave, the number of pediatric COVID-19 encephalitis cases progressed rapidly and mortality was high, particularly among children <5 years of age, regardless of comorbidities. We recommend COVID-19 vaccination and monitoring for signs of COVID-19 encephalitis in young children.
Keywords: COVID-19; SARS-CoV-2; encephalitis; omicron; pediatric.