Table 1.

Studies reporting on the effects of Covid-19 on γδ T cells and related cytokines.

	Donor Cohort	Covid-19 Patients	Blood vs Tissue	Ref
γδ T cells	98 healthy controls, 7 healthy child controls, 25 child patients, 68 patients	Decreased	Not significant	(55, 68–70)
δ2 T cells	92 healthy controls, 84 adult patients	Decreased	NA	(55, 67, 70)
δ1 T cells	20 healthy controls, 30 adult patients	No significant difference	NA	(55)
Activation Markers	38 healthy controls, 68 patients	Increased	NA	(55, 68)
Exhaustion Markers	20 healthy controls, 30 patients	increased	Higher in Tissue than in Blood	(55)
IFN-γ	20 healthy controls, 7 healthy child controls, 30 patients, 23 child patients	No significant difference	Higher in Tissue than in Blood	(55, 69)

NA, not applicable.