Characteristics of acute chikungunya virus infection in children: an epidemiological study in the Department of Caaguazú, Paraguay

Introduction: The rapid transmission and severe symptoms associated with acute chikungunya virus (CHIKV) infection in children make it a highly concerning health issue. Objective: This study aimed to describe the characteristics of acute chikungunya virus infection in children from the Department of Caaguazú, Paraguay. Material and Methods: A retrospective observational study was conducted in the Department of Caaguazú, Paraguay, in 2023, with all patients who came to the Regional Hospital within 5 days of developing characteristic symptoms of acute CHIKV infection and tested positive for the virus by RT-PCR. Patients with Dengue or Zika infections were excluded. We collected data on clinical characteristics using a standardized case record form and created an electronic dataset for analysis. Results: A total of 461 children were included in the study. 51.6% were women. Cases were divided into groups based on pediatric age: infants (0-23 months, n=88, 19.1%), preschoolers (2-5 years, n=115, 24.9%), schoolchildren (6-11 years, n=163, 35.4%), and adolescents (12-17 years and 11 months, n=95, 20.6%). Schoolchildren and adolescents experienced a higher prevalence of myalgia (64.6%) and arthralgia (63.7%). Vomiting (89%), headache (89.4%), and retro-orbital pain (95%) were more common in preschoolers, schoolchildren, and adolescents, while rash (39.5%) and petechiae (18.5%) were more prevalent in infants. Four children died during the study period. Conclusion: The 2023 CHIKV virus epidemic in Paraguay had different clinical presentations depending on the age of the affected children, with fatal outcomes occurring in a small percentage of cases.