Patients with neonatal listeriosis presented some biomarkers of poor prognosis, such as hypervirulent LM strains and low ratios of TNF-α/IL-6, as well as some biomarkers of better prognosis, such as high titres of anti-GAPDH1-22 antibodies and normal percentages of monocytes and CD8+ T cells. This evidence concerns the gene TNF and listeriosis.