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Deprecated: Implicit conversion from float 227.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2021 ; 12 (1): 4678 Nephropedia Template TP
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SARS-CoV-2 specific T cell responses are lower in children and increase with age and time after infection #MMPMID34326343
Cohen CA; Li APY; Hachim A; Hui DSC; Kwan MYW; Tsang OTY; Chiu SS; Chan WH; Yau YS; Kavian N; Ma FNL; Lau EHY; Cheng SMS; Poon LLM; Peiris M; Valkenburg SA
Nat Commun 2021[Jul]; 12 (1): 4678 PMID34326343show ga
SARS-CoV-2 infection of children leads to a mild illness and the immunological differences with adults are unclear. Here, we report SARS-CoV-2 specific T cell responses in infected adults and children and find that the acute and memory CD4(+) T cell responses to structural SARS-CoV-2 proteins increase with age, whereas CD8(+) T cell responses increase with time post-infection. Infected children have lower CD4(+) and CD8(+) T cell responses to SARS-CoV-2 structural and ORF1ab proteins when compared with infected adults, comparable T cell polyfunctionality and reduced CD4(+) T cell effector memory. Compared with adults, children have lower levels of antibodies to beta-coronaviruses, indicating differing baseline immunity. Total T follicular helper responses are increased, whilst monocyte numbers are reduced, indicating rapid adaptive co-ordination of the T and B cell responses and differing levels of inflammation. Therefore, reduced prior beta-coronavirus immunity and reduced T cell activation in children might drive milder COVID-19 pathogenesis.