* pregnant women * asplenia * ascites * open wound/sores near the stimulation site * recent abdominal surgery * splenomegaly * mechanically ventilated (if patient goes onto mechanical ventilation while participating in the study, they can continue ultrasound treatment if recommended by standard of care clinician and investigators of the study) * comfort care status * any other clinical reasons deemed by the investigators of the study in which the patient would not be an appropriate candidate for the study

* pregnant women * asplenia * ascites * open wound/sores near the stimulation site * recent abdominal surgery * splenomegaly * mechanically ventilated (if patient goes onto mechanical ventilation while participating in the study, they can continue ultrasound treatment if recommended by standard of care clinician and investigators of the study) * comfort care status * any other clinical reasons deemed by the investigators of the study in which the patient would not be an appropriate candidate for the study

- pregnant women - asplenia - ascites - open wound/sores near the stimulation site - recent abdominal surgery - splenomegaly - mechanically ventilated (if patient goes onto mechanical ventilation while participating in the study, they can continue ultrasound treatment if recommended by standard of care clinician and investigators of the study) - comfort care status - any other clinical reasons deemed by the investigators of the study in which the patient would not be an appropriate candidate for the study

- pregnant women - asplenia - ascites - open wound/sores near the stimulation site - recent abdominal surgery - splenomegaly - mechanically ventilated (if patient goes onto mechanical ventilation while participating in the study, they can continue ultrasound treatment if recommended by standard of care clinician and investigators of the study) - comfort care status - any other clinical reasons deemed by the investigators of the study in which the patient would not be an appropriate candidate for the study