In addition, undiagnosed meningoencephalitis patients had higher values of the upper-left corner of the graph (high cytokine levels with low cellularity) for both TNF-α (39 %) and IL-17 (31 %) when compared to patients with virus-positive meningoencephalitis (TNF-α = 13 % and IL-17 = 5 %). Here, TNF is linked to meningoencephalitis.