Characterizing Long COVID Symptoms During Early Childhood.

Area of Science:

• Pediatric infectious diseases
• Longitudinal cohort studies
• Symptom pattern analysis

Background:

• Long COVID (LC) is poorly understood in early childhood, creating a critical knowledge gap for this population.
• Existing LC symptom patterns are primarily identified in adults and children over 5 years old.
• Early identification and care for pediatric LC are hindered by the lack of specific characterization in young children.

Purpose of the Study:

• To identify distinct symptom frequencies in children with and without SARS-CoV-2 infection history.
• To differentiate symptom types by age group: infants/toddlers (0-2 years) and preschool-aged children (3-5 years).
• To develop a research index for identifying young children with probable Long COVID (LC).

Main Methods:

• A multisite longitudinal cohort study involving over 30 US healthcare and community settings.
• Inclusion of infants, toddlers, and preschool-aged children with and without a history of SARS-CoV-2 infection.
• Analysis of 41 symptoms in infants/toddlers and 75 symptoms in preschool-aged children to derive age-specific LC indices.

Main Results:

• A Long COVID (LC) research index was derived for infants/toddlers (e.g., poor appetite, trouble sleeping) and preschool-aged children (e.g., daytime tiredness, dry cough).
• Probable LC was identified in 14% of infected infants/toddlers (index ≥ 4) and 15% of infected preschool-aged children (index ≥ 3).
• Higher index scores correlated with poorer overall health, reduced quality of life, and perceived developmental delays.

Conclusions:

• This study identified distinct Long COVID (LC) symptom patterns in infants/toddlers and preschool-aged children, differing from older age groups.
• The derived research indices provide a novel tool for identifying probable LC in young children.
• Characterizing LC separately across different pediatric age ranges is crucial for effective clinical management and research.