Acta Paediatr. 2023 Feb 11. doi: 10.1111/apa.16705. Online ahead of print.
ABSTRACT
AIM: The immune status of children recovering from SARS-CoV-2 infection is not completely understood. We describe IgG anti-spike persistence in children infected during the first two pandemic waves. In addition, we compared with healthy controls their leukocyte populations and CD64 expression.
METHODS: Cross-sectional study. Done from October 2021 to February 2022 in non-reinfected and non-vaccinated children with SARS-CoV-2 in 2020. The presence of anti-spike IgG was studied using chemiluminescent immunoassay. Leukocyte populations were analysed using flow cytometry and marked for CD45, CD4, CD8, and CD64. Statistical minor than 0,05 was considered significant.
RESULTS: One hundred eighty-three control and 77 patients were included. IgG anti-spike determinations were performed after a median of 501 days (262-464); 52/77 children were positive. Cases showed significantly higher percentages of monocytes, lymphocytes, CD8+ and CD4+. In addition, CD64 expression was higher in monocytes and neutrophils. The presence of IgG anti-spike was accompanied by a higher percentage of CD64+ neutrophils.
CONCLUSION: In our series, the SARS-CoV-2 IgG anti-spike protein was usually positive beyond one year after infection. Furthermore, leukocyte populations from cases differ from controls, with higher CD64 expression on neutrophils and monocytes. Prospective clinical observations are required to confirm the implications of these findings.
PMID:36772991 | DOI:10.1111/apa.16705