HAVCR2 and COVID-19: Compared to healthy subjects, Vδ1+ and Vδ2+ T lymphocytes from hospitalized COVID-19 patients had a statistically significant increase in the expression of the exhaustion markers PD-1 and TIM-3, either alone or in combination, measured both as a percentage of positive cells and mean fluorescence intensity (MFI), highly suggestive of their exhaustion status.