TNF and keratitis: Serum cytokine measurements showed comparable levels of proinflammatory cytokines IL1β, IL-6, TNFα, IL-8 and IFN-γ for 2.II.1 (sample obtained at a time of remission, yet no sample was available during disease activity for comparison) and high levels for 2.III.1 (sample obtained during active keratitis) compared to healthy controls.