The Impact of Asthma on Covid-19 Disease Severity in Children and Adolescents During the Delta
Wave
Asvini Balasubramaniam1, Elisa Marte2,3, Jacqueline Leff3, Rubab Sohail4
and Pushpom James1*
1Pediatric Department, Staten Island University Hospital, Staten Island, New York, USA
2Loma Linda University Children’s Hospital, Loma Linda, USA
3Touro College of Osteopathic Medicine, New York City, USA
4Biostatistics Unit, Northwell Health, Staten Island, USA
*Corresponding Author: Pushpom James, Pediatric Department, Staten Island
University Hospital, Staten Island, New York, USA
Received:
June 11, 2025; Published: June 28, 2025
Abstract
Objectives: During the Alpha wave of the COVID-19 pandemic, asthmatic children initially appeared to have some protection but
later exhibited more severe disease when presenting to the emergency department (ED). Given the Delta wave’s higher transmissibil
ity and viral loads, this study aims to examine whether similar trends persisted during the Delta wave.
Methods: A retrospective chart review across our health system was conducted to compare differences among asthmatics vs. non
asthmatic pediatric patients. We reviewed hospitalization rates and vaccination status of patients 6-18 years old who presented to
the ED between June to December 2021 and tested COVID-19 positive. For hospitalized patients, we analyzed respiratory support
rates and complications using order summaries, flowsheet data, and ICD10 codes.
Results: Based on 464 patients, asthmatics had a statistically higher hospitalization rates than non-asthmatics (24% vs 6%). Unvac
cinated asthmatics were significantly more likely to be hospitalized than their non-asthmatic counterparts. Among the hospitalized
patients, a higher proportion of asthmatics required respiratory support and developed complications compared to non-asthmatic
patients. These differences however did not reach statistical significance, likely limited by a small sample size.
Conclusions: This study revealed that pediatric and adolescent asthmatics with COVID-19 during the Delta wave are a vulnerable
group who may require increased monitoring.
Keywords: Pediatric COVID-19; Delta Variant; Hospitalization Rates; Respiratory Complications; Co-Morbidities; Vaccination
References
- Respiratory Infections and Asthma. “Centers for Disease Control and Prevention” (2023).
- Hartnett KP., et al. “Impact of the COVID-19 pandemic on emergency department visits — United States, January 1, 2019–May 30, 2020”. MMWR Morbidity and Mortality Weekly Report23 (2020): 699-704.
- Navalpakam A., et al. “The impact of coronavirus disease 2019 on pediatric asthma in the United States”. Pediatric Clinics of North America 68.5 (2021): 1119-1131.
- Robbins E., et al. “The Impact of Asthma on COVID-19 Disease Severity in Children and Adolescents”. Journal of Asthma6 (2022): 1097-1103.
- Samieefar N., et al. “Delta Variant: The New Challenge of COVID-19 Pandemic, an Overview of Epidemiological, Clinical, and Immune Characteristics”. Acta Biomed1 (2022): e2022179.
- Thelwall S., et al. “Risk of hospitalisation and death in children with SARS-CoV-2 delta (B.1.612.2) infection”. The Lancet Child & Adolescent Health5 (2022).
- Dhawan M., et al. “Delta variant (b.1.617.2) of SARS-COV-2: Mutations, impact, challenges and possible solutions”. Human Vaccines & Immunotherapeutics5 (2022).
- Atherstone CJ., et al. “COVID-19 Epidemiology during Delta Variant Dominance Period in 45 High-Income Countries, 2020–2021”. Emerging Infectious Diseases9 (2023): 1757-1764.
- Chatterjee S., et al. “A Detailed Overview of SARS-CoV-2 Omicron: Its Sub-Variants, Mutations and Pathophysiology, Clinical Characteristics, Immunological Landscape, Immune Escape, and Therapies”. Viruses1 (2023): 167.
- Waghmare A and Hijano DR. “SARS-COV-2 infection and COVID-19 in children”. Clinics in Chest Medicine2 (2023): 359-371.
- Iannella G., et al. “Impact of COVID-19 pandemic on the incidence of otitis media with effusion in adults and children: a multicenter study”. European Archives of Oto-Rhino-Laryngology5 (2021): 2383-2389.
- Coronavirus (COVID-19) Update: FDA Authorizes Pfizer-BioNTech COVID-19 Vaccine for Emergency Use in Adolescents in Another Important Action in Fight Against Pandemic. U.S. Food and Drug Administration (2021).
- FDA Authorizes Pfizer-BioNTech COVID-19 Vaccine for Emergency Use in Children 5 through 11 Years of Age. U.S. Food and Drug Administration (2021).
- Most Recent National Asthma Data. Centers for Disease Control and Prevention. May 10, (2023).
- Leatherman J. “Mechanical ventilation for severe asthma”. Chest6 (2025): 1671-1680.
- Han MS., et al. “Distinct Clinical and Laboratory Features of COVID-19 in Children During the Pre-Delta, Delta and Omicron Wave”. Pediatric Infectious Disease Journal5 (2023): 423-428.
- Ong SW., et al. “Clinical and Virological Features of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Variants of Concern: A Retrospective Cohort Study Comparing B.1.1.7 (Alpha), B.1.351 (Beta), and B.1.617.2 (Delta)”. Clinical Infectious Diseases1 (2021).
- Molteni E., et al. “Illness Characteristics of COVID-19 in Children infected with the SARS-COV-2 delta variant”. Children 5 (2022): 652.
- Zhou P., et al. “A pneumonia outbreak associated with a new coronavirus of probable bat origin”. Nature 7798 (2020): 270-273.
- Jia HP., et al. “ACE2 receptor expression and severe acute respiratory syndrome coronavirus infection depend on differentiation of human airway epithelia”. Journal of Virology23 (2005): 14614-14621.
- Zhang X., et al. “Pathogen-host adhesion between SARS-COV-2 spike proteins from different variants and human ACE2 studied at single-molecule and single-cell levels”. Emerging Microbes and Infections1 (2022): 2658-2669.
- Chatziparasidis G and Kantar A. “COVID-19 in Children with Asthma”. Lung1 (2021): 7-12.
- Zhao H., et al. “SARS-CoV-2 Omicron variant shows less efficient replication and fusion activity when compared with Delta variant in TMPRSS2-expressed cells”. Emerging Microbes & Infections1 (2022): 277-283.
- Skevaki C., et al. “Asthma-associated risk for COVID-19 development”. Journal of Allergy and Clinical Immunology 6 (2020): 1295-1301.
- Kuruvilla ME., et al. “Understanding asthma phenotypes, endotypes, and mechanisms of disease”. Clinical Reviews in Allergy & Immunology2 (2018): 219-233.
- Gergen PJ., et al. “Total IGE levels and asthma prevalence in the US population: Results from the National Health and Nutrition Examination Survey 2005-2006”. Journal of Allergy and Clinical Immunology3 (2009): 447-453.
- Jackson DJ., et al. “Association of respiratory allergy, asthma, and expression of the SARS-COV-2 receptor ACE2”. Journal of Allergy and Clinical Immunology1 (2020).
- Cakebread JA., et al. “Exogenous IFN-β has antiviral and anti-inflammatory properties in primary bronchial epithelial cells from asthmatic subjects exposed to rhinovirus”. Journal of Allergy and Clinical Immunology5 (2011).
- Tang F., et al. “Plasmacytoid dendritic cells in antiviral immunity and autoimmunity”. Science China Life Sciences2 (2010): 172-182.
- Wanga V., et al. “Long-Term Symptoms Among Adults Tested for SARS-CoV-2 — United States, January 2020–April 2021”. MMWR Morbidity and Mortality Weekly Report36 (2021): 1235-1241.
- “Real-world study tracks vaccine’s power to protect kids from Delta and omicron variants”. News (2024).
- Lopez Bernal J., et al. “Effectiveness of covid-19 vaccines against the B.1.617.2 (delta) variant”. New England Journal of Medicine7 (2021): 585-594.
- Bian L., et al. “Impact of the Delta variant on vaccine efficacy and response strategies”. Expert Review of Vaccines10 (2021): 1201-1209.
- Thanik E., et al. “Impact of COVID-19 on pediatric asthma-related healthcare utilization in New York City: a community-based study”. BMC Pediatrics1 (2023).
- Bogan E., et al. “Wearing a Mask Won't Protect Us from Our History”: The Impact of COVID‐19 on Black Children and Families”. Social Policy Report2 (2022): 1-33.
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