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It is plausible but by no means established that antipyretics (fever suppressors) in particular could increase the duration of infection/symptoms, because fever is part of a functional immune response. From Graham et al 1990 (a small [n=56] randomized trial of the use of antipyretic pain relievers in volunteers experimentally infected with rhinovirus): ...


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Normal, "non-super" antigens activate T-cells in the following manner: they are first engulfed and processed by a professional antigen presenting cell (APC), e.g., a macrophage. The processed antigen is then presented along with an MHC class II molecule on the surface of this cell. The T-cell's T Cell Receptor (TCR) then binds this complex; it must be able ...


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