Systemic and mucosal antibody responses specific to SARS-CoV-2 during mild versus severe COVID-19.

J Allergy Clin Immunol · 2021 · PMC7677074 · PMID 33221383

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highly significantno p-value reported

Conversely, patients with severe COVID-19 showed a highly significant increase of SARS-CoV-2–specific serum IgA and IgG titers after symptom onset.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.