In a recent study published in the Jama Network Open, researchers assessed whether croup infections among young children in the United States were associated with the emergence of new worrying variants of severe acute respiratory syndrome coronavirus 2 (SARS). -CoV-2). VOC) Omicron.
Study: analysis of the predominance of the crop related to COVID-19 and the SARS-CoV-2 variant in the USA. Image credit: SUKJAI PHOTO / Shutterstock
Fund
Although limited to small case series, previous studies have associated SARS-CoV-2 with upper respiratory tract infections (UAIs), including laryngotracheobronchitis or croup in young children who have susceptible and relatively foldable airways. Since Omicron replicates more efficiently in the human respiratory tract, it is important to investigate how its occurrence in the U.S. affected the incidence of croup cases among young children.
About the study
In the present cross-sectional study, the authors enrolled children aged three months to eight years diagnosed with crop and coronavirus disease 2019 (COVID-19) between January 1, 2021 and March 26, 2022. They used health pediatric. data from the information system of 43 pediatric hospitals in U.S. states. In addition, the researchers used the codes of the International Statistical Classification of Diseases and Related Health Problems, Tenth Revision (ICD-10) to classify test subjects based on the diagnosis of the disease.
The team used COVID data tracking from the U.S. Centers for Disease Control and Prevention (CDC) to determine the predominance period of SARS-CoV-2 VOCs (the period in which a VOC is most responsible for 50% of COVID-19 cases). CDC data estimate SARS-CoV-2 VOC ratios by genomic monitoring that takes into account longitudinal sampling at inter- and intrastate levels.
The main outcome of the study was the incidence of croup related to COVID-19; Secondary outcomes included assessment of an association between increased hospital admissions and the intensive care unit (ICU) and treatment with racemic epinephrine (RE) among children and periods of SARS-VOC dominance. CoV-2. The team summarized the croup incidences per week and period of predominance of variants.
In addition, the researchers deployed a mixed-effects logistic regression model to assess the association of the SARS-CoV-2 VOC predominance period with hospitalization / ICU admissions and RE use. The model was adjusted for the age, gender, race / ethnicity, insurance status, and region of each participant.
Study results
The researchers identified 5,152 children with SARS-CoV-2-related croup with a mean age of 17 months, of whom 3329 were boys. The percentage of children with croup related to SARS-CoV-2 was substantially higher during the wave of Omicron infections than Alpha or Delta VOCs (10.9% vs. 41,% vs. 3.6%). ). However, hospitalization probabilities during the predominant periods of Alpha, Delta, and Omicron VOCs were comparable to an adjusted probability ratio. [aOR] of 1.28 for Alpha and 0.92 for Delta. Similarly, the use of RE was less likely during the Delta-dominated period (aOR 0.73) and did not alter much during the Alpha-dominated period (aOR 1.03) compared to the predominant time. of Omicron. In addition, the ICU admission rate remained statistically similar during the periods of dominance of several SARS-CoV-2 VOCs, which could be due to limitations in ICU capacity or less severe illness.
Conclusions
The current study expanded the evidence gathered by single-center studies; in addition, their results were consistent with another recent study that showed an increase in the percentage of young children who had UAI during COVID-19. These figures increased from 1.4% during the pre-Omicron period to 4.1% during the Omicron period. The use of ICD-10 codes in the present study (rather than a positive SARS-CoV-2 test result) resulted in the observed increase in the hospitalization rate for the SARS-related croup. -CoV-2 after the advent of Omicron.
In addition, the study demonstrated mixed results regarding the severity of the COVID-19-related croup. The authors observed an increase in the proportion of children in need of RE during the Omicron and Alpha periods compared to the time of Delta predominance. However, there was no difference in the mean number of RE doses required.
As COVID-19 becomes endemic, other viral infections, including croup, can lead to an increase in patient volume. Therefore, the authors emphasized the need for continuous monitoring of SARS-CoV-2 phenotypes and their relationship to increasing patient volume, especially in pediatric health systems.