The investigators will collect a nasal swab and blood sample from the participant when the participant is enrolled on the study and if the participant develops a RVI in the first year after transplant. The investigators will collect a blood sample 100 days after the participant's transplant.
The participants are being asked to take part in this clinical trial, a type of research study, because the participants are scheduled to receive or have recently received a hematopoietic cell transplant (HCT) or a solid organ transplant (SOT).~Primary Objective~To determine if pre-transplant screening for respiratory viral load predicts RVI within 1- year post-transplant among survivors.~Secondary Objectives:~To develop and validate a classifier based on pre-transplant immunological profile predictive of developing an acute respiratory viral infection (aRVI), with RSV/PIV3/HMPV/SARS-CoV-2 through one-year post-transplant among survivors.~To develop and validate a classifier based on Day +100 post-transplant immunological profiles predictive of developing an acute respiratory viral infection (aRVI),with RSV/PIV3/HMPV/SARS-CoV-2 through one-year post-transplant among survivors .