Persistent CD19⁺ B cell lymphopenia in critically ill COVID-19 patients 50 days after symptom onset.

Moreover, there was a notable positive correlation between the count of Tregs and the count of B cells in severe cases, while this correlation coefficient was larger in critical cases, although it did not reach statistical significance due to the limited sample size in this group (r=0.71, p=0.136, n=6).

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