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Article ; Online: Risk factors for severity in seasonal respiratory viral infections and how they guide management in hematopoietic cell transplant recipients.

Matsui, Toshihiro / Ogimi, Chikara

2023 Volume 36, Issue 6, Page(s) 529–536

Abstract: Purpose of review: Seasonal respiratory virus infections (RVIs) often progress to severe diseases in hematopoietic cell transplant (HCT) recipients. This review summarizes the current evidence on risk factors for the severity of RVIs in this high-risk ... ...

Abstract	Purpose of review: Seasonal respiratory virus infections (RVIs) often progress to severe diseases in hematopoietic cell transplant (HCT) recipients. This review summarizes the current evidence on risk factors for the severity of RVIs in this high-risk population and provides clinical management. Recent findings: The likelihood of the respiratory viral disease progression depends on the immune status of the host and the type of virus. Conventional host factors, such as the immunodeficiency scoring index and the severe immunodeficiency criteria, have been utilized to estimate the risk of progression to severe disease, including mortality. Recent reports have suggested nonconventional risk factors, such as hyperglycemia, hypoalbuminemia, prior use of antibiotics with broad anaerobic activity, posttransplant cyclophosphamide, and pulmonary impairment after RVIs. Identifying novel and modifiable risk factors is important with the advances of novel therapeutic and preventive interventions for RVIs. Summary: Validation of recently identified risk factors for severe RVIs in HCT recipients is required. The development of innovative interventions along with appropriate risk stratification is critical to improve outcomes in this vulnerable population.
MeSH term(s)	Humans ; Hematopoietic Stem Cell Transplantation/adverse effects ; Transplant Recipients ; Seasons ; Risk Factors ; Virus Diseases/epidemiology ; Virus Diseases/etiology ; Respiratory Tract Infections/epidemiology ; Retrospective Studies
Language	English
Publishing date	2023-09-20
Publishing country	United States
Document type	Review ; Journal Article
ZDB-ID	645085-4
ISSN	1473-6527 ; 1535-3877 ; 0951-7375 ; 1355-834X
ISSN (online)	1473-6527 ; 1535-3877
ISSN	0951-7375 ; 1355-834X
DOI	10.1097/QCO.0000000000000968
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Article ; Online: Epiglottitis-Like Symptoms of COVID-19 in the Omicron Wave.

Iijima, Hiroyuki / Tomita, Keiichi / Okamoto, Reiko / Ogimi, Chikara

Indian journal of pediatrics

2022 Volume 89, Issue 11, Page(s) 1152–1153

MeSH term(s)	COVID-19 ; Epiglottitis/diagnosis ; Humans
Language	English
Publishing date	2022-09-20
Publishing country	India
Document type	Journal Article
ZDB-ID	218231-2
ISSN	0973-7693 ; 0019-5456
ISSN (online)	0973-7693
ISSN	0019-5456
DOI	10.1007/s12098-022-04371-1
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Article ; Online: Change in Seizure Incidence in Febrile Children With COVID-19 in the Era of Omicron Variant of Concern.

Iijima, Hiroyuki / Kubota, Mitsuru / Ogimi, Chikara

Journal of the Pediatric Infectious Diseases Society

2022 Volume 11, Issue 11, Page(s) 514–517

Abstract: In this single-center retrospective observational study, we report that the incidence of seizures in febrile children with COVID-19 was significantly higher in the Omicron era than in the pre-Omicron era (14.6% vs 1.7%, P < .001). One-third of the cases ... ...

Abstract	In this single-center retrospective observational study, we report that the incidence of seizures in febrile children with COVID-19 was significantly higher in the Omicron era than in the pre-Omicron era (14.6% vs 1.7%, P < .001). One-third of the cases in the Omicron era were older than 5 years.
MeSH term(s)	Child ; Humans ; Incidence ; COVID-19/epidemiology ; SARS-CoV-2 ; Fever/etiology ; Seizures/epidemiology ; Seizures/etiology
Language	English
Publishing date	2022-08-19
Publishing country	England
Document type	Observational Study ; Journal Article
ZDB-ID	2668791-4
ISSN	2048-7207 ; 2048-7193
ISSN (online)	2048-7207
ISSN	2048-7193
DOI	10.1093/jpids/piac085
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Article ; Online: Acute cerebellar ataxia during acute COVID-19: A case series and review of the literature.

Takao, Hiroyuki / Iijima, Hiroyuki / Odagiri, Rika / Hayakawa, Itaru / Ogimi, Chikara

Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy

2023 Volume 29, Issue 8, Page(s) 792–795

Abstract: Acute coronavirus disease 2019 (COVID-19)-associated cerebellar ataxia without multisystem inflammatory syndrome in children (MIS-C) or encephalopathy in children has been rarely reported. We reviewed medical records of hospitalized children who had ... ...

Abstract	Acute coronavirus disease 2019 (COVID-19)-associated cerebellar ataxia without multisystem inflammatory syndrome in children (MIS-C) or encephalopathy in children has been rarely reported. We reviewed medical records of hospitalized children who had developed cerebellar ataxia during the acute phase of COVID-19 infection, without MIS-C or encephalopathy, in our center. We also conducted a literature review and summarized the clinical characteristics, treatment, and outcomes. We found three cases in our center and additional three cases in the literature. All patients were male and five were preschool children. The cerebellar symptoms started between day 2 and day 10 during the acute phase of the COVID-19 infection. Two cases were complicated by mutism. One patient received therapy for acute cerebellar ataxia with corticosteroids, and others did not receive any specific therapy for acute cerebellar ataxia. The symptoms improved completely in all patients, with the recovery interval ranging from one week to two months. Further studies are warranted to elucidate the pathogenesis of acute cerebellar ataxia during acute COVID-19 in children.
MeSH term(s)	Child, Preschool ; Humans ; Male ; Female ; Cerebellar Ataxia/diagnosis ; COVID-19/complications ; COVID-19/pathology ; Cerebellum/pathology ; Brain Diseases ; Systemic Inflammatory Response Syndrome/complications ; Systemic Inflammatory Response Syndrome/pathology
Language	English
Publishing date	2023-04-13
Publishing country	Netherlands
Document type	Review ; Case Reports
ZDB-ID	1355399-9
ISSN	1437-7780 ; 1341-321X
ISSN (online)	1437-7780
ISSN	1341-321X
DOI	10.1016/j.jiac.2023.04.003
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Article ; Online: Natural course of acute COVID-19 among healthy children in a tertiary hospital.

Kondo, Ryota / Iijima, Hiroyuki / Funaki, Takanori / Ishiguro, Akira / Ogimi, Chikara

Pediatrics international : official journal of the Japan Pediatric Society

2023 Volume 65, Issue 1, Page(s) e15647

Abstract: Background: Previous studies have reported the clinical and epidemiological characteristics of children with coronavirus disease 2019 (COVID-19) in a cross-sectional fashion; however, the natural course of each symptom based on a daily basis during the ... ...

Abstract	Background: Previous studies have reported the clinical and epidemiological characteristics of children with coronavirus disease 2019 (COVID-19) in a cross-sectional fashion; however, the natural course of each symptom based on a daily basis during the acute phase has not yet been clarified. This retrospective study aimed to describe the natural course of COVID-19 in children according to dominant variants. Methods: We conducted our study on symptomatic children with COVID-19 who were hospitalized at the National Center for Child Health and Development, in Japan. We excluded patients who were observed for less than 9 days and those with underlying disease, COVID-19 vaccination, coinfection, complications, or therapeutic intervention. We collected the data on each participant's age at admission, sex, medical history, observation period, hospitalization period, SARS-CoV-2 test results, and 10 daily symptoms in the first 9 days from the illness onset. Results: Eventually, 115 children were included in this study. The prevalence of fever during the omicron era declined more rapidly over time than that during the pre-omicron era. The prevalence of cough and rhinorrhea did not decline during the observation period, and these clinical manifestations were more common during the pre-omicron era at any point. The prevalence of dysgeusia and/or dysosmia steadily increased over time in the pre-omicron era. This study demonstrated that the prevalence of some symptoms differed not only at the onset but also over time during the acute phase. Conclusion: Details of the natural clinical course of children with COVID-19 help primary care physicians to manage these patients.
MeSH term(s)	Humans ; Child ; COVID-19/epidemiology ; Tertiary Care Centers ; SARS-CoV-2 ; COVID-19 Vaccines ; Cross-Sectional Studies ; Retrospective Studies
Chemical Substances	COVID-19 Vaccines
Language	English
Publishing date	2023-10-04
Publishing country	Australia
Document type	Journal Article
ZDB-ID	1470376-2
ISSN	1442-200X ; 1328-8067
ISSN (online)	1442-200X
ISSN	1328-8067
DOI	10.1111/ped.15647
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Article ; Online: Clinical Practice Patterns and Risk Factors for Severe Conditions in Pediatric Hospitalizations With Respiratory Syncytial Virus in Japan: A Nationwide Analyses (2018-2022).

Okubo, Yusuke / Uda, Kazuhiro / Ogimi, Chikara / Shimabukuro, Rinshu / Ito, Kenta

The Pediatric infectious disease journal

2023 Volume 43, Issue 3, Page(s) 187–193

Abstract: Background: Respiratory syncytial virus (RSV) represents a global health challenge, especially among younger children. While the disease burden in Japan has been preliminarily quantified, there remains a lack of comprehensive understanding regarding ... ...

Abstract	Background: Respiratory syncytial virus (RSV) represents a global health challenge, especially among younger children. While the disease burden in Japan has been preliminarily quantified, there remains a lack of comprehensive understanding regarding treatment patterns and the influence of known risk factors at a national scale. Materials and methods: We conducted a retrospective cohort study consisting of 50,482 children under 5 years hospitalized with RSV infections during 2018-2022 using the Medical Data Vision database. We investigated trends in patient characteristics, health resource use, treatment patterns, and laboratory data. Additionally, multivariable modified Poisson regression models were used to investigate the risk factors associated with severe conditions. Results: We observed an increasing trend in the inpatient healthcare costs and decreasing trends in the use of antibiotics, bronchodilators, systemic corticosteroids and other symptomatic medications from 2018 to 2022. Risk factors associated with severe RSV infections were children less than 1 year (risk ratio, 2.90; 95% CI: 2.53-3.32) and the number of complex chronic diseases (risk ratio for 1 disease, 2.68; 95% CI: 2.34-3.06: risk ratio for 2 or more diseases, 6.91; 95% CI: 5.81-8.21). Annual inpatient healthcare costs for RSV infections were estimated at 11-14 billion Japanese Yen for younger children. Conclusions: Our study observed the changes in practice patterns and health resource use for children hospitalized with RSV infections and identified risk factors associated with severe conditions. These findings provide insights for policymakers and clinicians aiming to devise strategies for further improving clinical practices, including newly developed vaccines and single-dose long-acting monoclonal antibodies.
MeSH term(s)	Humans ; Child ; Infant ; Child, Preschool ; Respiratory Syncytial Virus Infections/drug therapy ; Respiratory Syncytial Virus Infections/epidemiology ; Japan/epidemiology ; Retrospective Studies ; Practice Patterns, Physicians' ; Hospitalization ; Respiratory Syncytial Virus, Human ; Risk Factors
Language	English
Publishing date	2023-11-21
Publishing country	United States
Document type	Journal Article
ZDB-ID	392481-6
ISSN	1532-0987 ; 0891-3668
ISSN (online)	1532-0987
ISSN	0891-3668
DOI	10.1097/INF.0000000000004181
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Article ; Online: Updates on Coronavirus Disease 2019 in Children in Japan.

Aizawa, Yuta / Takanashi, Sayaka / Ogimi, Chikara

The Pediatric infectious disease journal

2022 Volume 41, Issue 11, Page(s) e461–e467

Abstract: This review provides updates on coronavirus disease 2019 (COVID-19) in children in Japan by summarizing published data. By the end of March 2022, Japan had experienced 6 waves of COVID-19 outbreaks. Over this time, the clinical features presented among ... ...

Abstract	This review provides updates on coronavirus disease 2019 (COVID-19) in children in Japan by summarizing published data. By the end of March 2022, Japan had experienced 6 waves of COVID-19 outbreaks. Over this time, the clinical features presented among children have changed in the context of the predominant variants. Although the COVID-19 pandemic affected children in terms of medical, physical and psychosocial aspects, the clinical outcomes have been favorable in Japan compared with those in some European countries and the United States, which may be partly due to a lower incidence of multisystem inflammatory syndromes in children and obesity. The COVID-19 vaccine has been available for children; however, the vaccination rate in children 5-11 years of age is lower than that in older children due to the government's lack of an active approach in this specific population. Further action is needed to improve the overall vaccination rates in children.
MeSH term(s)	COVID-19/complications ; COVID-19/epidemiology ; COVID-19 Vaccines ; Child ; Humans ; Japan/epidemiology ; Pandemics/prevention & control ; Systemic Inflammatory Response Syndrome ; United States ; Vaccination
Chemical Substances	COVID-19 Vaccines
Language	English
Publishing date	2022-07-18
Publishing country	United States
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ZDB-ID	392481-6
ISSN	1532-0987 ; 0891-3668
ISSN (online)	1532-0987
ISSN	0891-3668
DOI	10.1097/INF.0000000000003641
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Article ; Online: Clinical characteristics of pediatric patients with COVID-19 between Omicron era vs. pre-Omicron era.

Iijima, Hiroyuki / Kubota, Mitsuru / Ogimi, Chikara

Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy

2022 Volume 28, Issue 11, Page(s) 1501–1505

Abstract: Introduction: Detailed data on clinical characteristics in children with the omicron strain of SARS-COV-2 are limited.: Methods: We conducted a retrospective observational study of children with COVID-19 at the National Center for Child Health and ... ...

Abstract	Introduction: Detailed data on clinical characteristics in children with the omicron strain of SARS-COV-2 are limited. Methods: We conducted a retrospective observational study of children with COVID-19 at the National Center for Child Health and Development to evaluate the clinical manifestations during and before the emergence of the omicron variant. Only symptomatic patients without underlying diseases were included. Participants were divided into two temporal groups: the "omicron era" (1/2022-2/2022) and the "pre-omicron era," where the delta variant predominated (7/2021-11/2021). The patients were subclassified into an older vaccine-eligible group (aged 12-17 years), a younger vaccine-eligible group (aged 5-11 years), and a vaccine-ineligible group (aged 0-4 years). Results: We compared 113 patients in the omicron era with 106 in the pre-omicron era. Most patients in both eras had non-severe disease, and no patients required mechanical ventilation or died. Among patients aged 0-4 years, sore throat and hoarseness were more common during the omicron era than the pre-omicron era (11.1% vs. 0.0% and 11.1% vs. 1.5%, respectively). Croup syndrome was diagnosed in all patients with hoarseness. Among patients aged 5-11 years, vomiting was more frequent during the omicron era (47.2%) than during the pre-omicron era (21.7%). Cough and rhinorrhea were less common during the omicron era in patients aged 0-4 and 5-11 years, respectively, than during the pre-omicron era. Conclusions: In children with COVID-19, clinical manifestations differed between the omicron and pre-omicron eras. In the Omicron era, croup syndrome was more frequent in vaccine-ineligible children.
MeSH term(s)	COVID-19/epidemiology ; Child ; Croup ; Hoarseness ; Humans ; SARS-CoV-2
Language	English
Publishing date	2022-08-04
Publishing country	Netherlands
Document type	Journal Article ; Observational Study
ZDB-ID	1355399-9
ISSN	1437-7780 ; 1341-321X
ISSN (online)	1437-7780
ISSN	1341-321X
DOI	10.1016/j.jiac.2022.07.016
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Article ; Online: Septic Arthritis Caused by Haemophilus parainfluenzae : A Pediatric Case Report and Literature Review.

Fukayama, Haruka / Myojin, Shota / Funaki, Takanori / Fukuda, Yoshitsugu / Nakamura, Tomoo / Ishiguro, Akira / Ogimi, Chikara

The Pediatric infectious disease journal

2023 Volume 42, Issue 9, Page(s) e336–e340

Abstract: We report a healthy 5-year-old boy without apparent risk factors who developed septic arthritis of the hip from Haemohilus parainfluenzae infection. A literature review revealed only 4 pediatric cases of osteoarticular infection caused by this pathogen. ... ...

Abstract	We report a healthy 5-year-old boy without apparent risk factors who developed septic arthritis of the hip from Haemohilus parainfluenzae infection. A literature review revealed only 4 pediatric cases of osteoarticular infection caused by this pathogen. To our knowledge, our case may be the first pediatric case of septic arthritis of the hip caused by H. parainfluenzae .
MeSH term(s)	Male ; Humans ; Child ; Child, Preschool ; Haemophilus parainfluenzae ; Haemophilus Infections/diagnosis ; Haemophilus Infections/drug therapy ; Risk Factors ; Arthritis, Infectious/diagnosis ; Arthritis, Infectious/drug therapy
Language	English
Publishing date	2023-05-24
Publishing country	United States
Document type	Review ; Case Reports ; Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	392481-6
ISSN	1532-0987 ; 0891-3668
ISSN (online)	1532-0987
ISSN	0891-3668
DOI	10.1097/INF.0000000000003979
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Article ; Online: Etiology of Severe Acute Hepatitis in a Pediatric Transplant Center in Japan.

Funaki, Takanori / Yamada, Masaki / Ide, Kentaro / Ito, Reiko / Shoji, Kensuke / Ogimi, Chikara / Imadome, Ken-Ichi / Kasahara, Mureo

Journal of the Pediatric Infectious Diseases Society

2023 Volume 12, Issue 4, Page(s) 248–251

Abstract: The proportion of pediatric cases with severe acute hepatitis of unknown etiology in the coronavirus disease 2019 era was higher than that in the pre-coronavirus disease 2019 era in Japan's largest pediatric transplant center. Further research and ... ...

Abstract	The proportion of pediatric cases with severe acute hepatitis of unknown etiology in the coronavirus disease 2019 era was higher than that in the pre-coronavirus disease 2019 era in Japan's largest pediatric transplant center. Further research and monitoring are essential.
MeSH term(s)	Child ; Humans ; Liver Transplantation/adverse effects ; Japan ; COVID-19 ; Hepatitis/etiology
Language	English
Publishing date	2023-03-14
Publishing country	England
Document type	Journal Article
ZDB-ID	2668791-4
ISSN	2048-7207 ; 2048-7193
ISSN (online)	2048-7207
ISSN	2048-7193
DOI	10.1093/jpids/piad021
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