Pediatr Infect Dis J . Distinct Immune Phenotypes and Cytokine Profiles in Children with Differing Severity of COVID-19

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Pediatr Infect Dis J


. 2022 Aug 24.
doi: 10.1097/INF.0000000000003669. Online ahead of print.
Distinct Immune Phenotypes and Cytokine Profiles in Children with Differing Severity of COVID-19


Laura Beatriz Talarico ^{1 2} , Analía Toledano ¹ , María Marta Contrini ³ , Lidia E Torrado ³ , María Paula Martínez ⁴ , María Isabel Gaillard ⁴ , Ana Caratozzolo ¹ , Alana Brooke Byrne ^{1 2} , Florencia Agustina Bonnin ¹ , María Soledad Tineo ³ , Eduardo Walter Yfran ³ , Patricio Leandro Acosta ^{1 2} , Eduardo Luis López ³



Affiliations

• PMID: 36102684
• DOI: 10.1097/INF.0000000000003669

Abstract

Background: Coronavirus disease 2019 (COVID-19) is usually mild and self-limited in children. However, a few Severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) infections in children may progress to severe disease with respiratory distress or can result in a multisystem inflammatory syndrome (MIS-C) associated with COVID-19. The immune mechanisms for these differential clinical outcomes are largely unknown.
Methods: A prospective cohort study was performed to analyze the laboratory parameters, antibody response, immune phenotypes and cytokine profiles of 51 children with different clinical presentations of COVID-19.
Results: We found that the absolute lymphocyte counts gradually decreased with disease severity. Furthermore, SARS-CoV-2 IgG levels in the acute phase and convalescence were not significantly different in patients with different disease severity. A decrease in CD3+, CD4+ and CD8+ T cells was observed as disease severity increased. Both CD4+ and CD8+ T cells were activated in children with COVID-19, but no difference in the percentage of HLADR+-expressing cells was detected across the severity groups. In contrast, MIS-C patients exhibited augmented exhausted effector memory CD8+ T cells. Interestingly, the cytokine profile in sera of moderate/severe and MIS-C patients revealed an increase in anti-inflammatory IL-1RA and a suppression of tumor necrosis factor-α, RANTES, eotaxin and PDGF-BB. MIS-C patients also exhibited augmented IL-1β.
Conclusions: We report distinct immune profiles dependent on severity in pediatric COVID-19 patients. Further investigation in a larger population will help unravel the immune mechanisms underlying pediatric COVID-19.