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Bacteriostatic preservatives like benzyl alcohol inhibit bacterial growth in multi-dose vials, which is essential for maintaining sterility through repeated needle punctures over weeks of use

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Other factors may also cause microglia to move to blood vessels and change phenotypes under different states [55]

Furthermore, we showed that exposure of brain endothelial cells to S protein resulted in an activated endothelial cell phenotype with upregulation of inflammatory cytokines and cell adhesion molecules and probably has a role in long COVID-associated brain fog