@windwalker I wasn't. able to post the link for CVID. They think CVID is genetic; I am not able to produce much of my own antibodies because my B cells are not working great, so I get antibodies from blood donations once every 3 weeks. Catching a cold can be dangerous or even turn deadly for people with CVID. Similar to bronchiectasis we are very vulnerable to bacterial infectious of the respiratory and gastrointestinal tract. I wear a mask around groups of people and children. I have been hospitalized many times for the wierdest infections. After awhile these infections cause damage.