FTA:

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Importantly, IgG fractions from the blood of these individuals cross-reacted with several types of mouse tissue in vitro, and transfer of this IgG to living mice reproduced symptoms such as pain, fatigue, coordination problems, temperature sensitivity and more. These effects were not seen with IGg transfer from unaffected patients. It hardly needs pointing out that you cannot transfer a nervous disposition or a persistent bad attitude by transfusing antibody fractions. Long Covid is a real a disease as lupus, MS, Hashimoto’s, or Type I diabetes, all of which are driven by production of antibodies to a person’s own tissues."