- Elimination of blood-derived macrophages inhibits the release of interleukin-1 and the entry of leukocytes into the cerebrospinal fluid in experimental pneumococcal meningitis. Zysk, G., Brück, W., Huitinga, I., Fischer, F.R., Flachsbarth, F., van Rooijen, N., Nau, R. J. Neuroimmunol. (1997)