[Meningitis and encephalitis in Poland in 1999].

2,020 cases of meningitis and 494 of encephalitis were reported in Poland in 1999. Among meningitis 1,024 cases were classified as viral and 996 as bacterial. Etiological factor was determined in 264 (26.5%) cases of bacterial meningitis. Among them Neisseria meningitidis was found in 119 cases, Haemophilus influenzae in 63 cases and Streptococcus pneumoniae in 90 cases. Among types of diagnosed N. meningitidis, as in previous years, type B was strongly predominating. Out of 494 cases of encephalitis 101 cases of tick borne encephalitis were reported in Poland in 1999, most of them from endemic areas of north-eastern part of the country.