The research objective is to assess the safety and potential efficacy of spleen ultrasound stimulation as an intervention for Long COVID in a pilot study. Specific Aims include: * Measure Long COVID disease activity before, during and after an 8-week course of spleen-directed daily ultrasound stimulation. * Measure molecular correlates of Long COVID disease activity before, during and after an 8-week course of spleen-directed daily ultrasound stimulation. * Track adverse events throughout the study to assess safety of the ultrasound intervention.
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Within-arm change in the endurance shuttle walk test (ESWT) from baseline to the completion of an up-to 8-week intervention period.
Timeframe: 8 weeks