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Microglial predominant inflammatory infiltrates. Representative images of CD45 immunohistochemistry highlight diffuse microglia and occasional perivascular lymphocytes in the frontal lobe (A, D, G), thalamus (B, E, H), and medulla (C, F, I), of a non-Delta/non-Omicron variant patient (A–C, Patient 2), a Delta variant patient (D–F, Patient 9), and an Omicron variant patient (G–I, Patient 21). All images taken with 10× objective.
