Epidemiology of meningitis due to Haemophilus influenzae type b in children in Bulgaria: a prospective, population-based surveillance study.
OBJECTIVE
To assess the incidence of meningitis caused by Haemophilus influenzae type b (Hib) among children in Bulgaria and to provide evidence for an informed decision on the use of Hib vaccines in Bulgaria.


METHODS
From 1 July 1997 to 31 December 1999, active surveillance for meningitis was conducted in six regions. For children with suspected meningitis, a cerebrospinal fluid (CSF) specimen was sent for cytology, chemistry, latex agglutination testing, culture and sensitivity.


RESULTS
During the 2.5-year study period, surveillance was conducted among 138 249 children aged <5 years - a sample representing 40% of all Bulgarian children in this age group. Overall, 285 children with suspected meningitis were identified. In eight children, clinical symptoms of meningitis resolved rapidly before a CSF specimen could be obtained. Of the remaining 277 children, 121 (44%) were classified as having probable bacterial meningitis on the basis of a CSF examination. An organism was identified for 88 (73%) of the 121 cases with probable bacterial meningitis. There were 21 cases of Hib, giving a mean annual incidence of 6.1 Hib meningitis cases per 100 000 children <5 years; the case-fatality rate was 10%. Nearly 60% of Hib isolates were resistant to one or more antibiotics, but they were not resistant to third-generation cephalosporins.


CONCLUSIONS
On the basis of these findings, Hib conjugate vaccines have been included in the list of vaccines recommended for children by the Bulgarian Ministry of Health. The recommended initial treatment for paediatric bacterial meningitis has been changed to third-generation cephalosporins.
Kojouharova
Mira
M
Department of Epidemiology and Infection Control, National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria.
Gatcheva
Nina
N
Setchanova
Lena
L
Robertson
Susan E
SE
Wenger
Jay D
JD
D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D002031:Bulgaria / Q000453:epidemiology; D002675:Child, Preschool; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D008583:Meningitis, Haemophilus / Q000134:cerebrospinal fluid / Q000188:drug therapy / Q000453:epidemiology*; D011159:Population Surveillance; D011446:Prospective Studies
D000900:Anti-Bacterial Agents