We report an unusual case of culture-proven pneumococcal and meningococcal mixed meningitis in an 18-month-old girl. The patient responded well to antimicrobial therapy and recovered completely without sequelae. No underlying condition could be demonstrated except a rhinitis of unknown etiology 2 days before the onset of the symptoms suggesting meningitis.
CASE REPORTAn 18-month-old girl was admitted to the emergency unit of the Montpellier Teaching Hospital in November 2003 for deteriorating general condition in the previous 48 h, with fever at 40°C, asthenia, and vomiting in a context of rhinitis. She had no previous medical history. On admission, she was lethargic and algetic but had no identified hemodynamic dysfunction. Physical examination revealed clear meningeal syndrome with stiff neck and Kernig and Brudzinsky signs. No focal signs or purpura were observed. She presented with pharyngitis, bilateral serous mucosal otitis, and cervical adenopathy of less than 1 cm. Laboratory evaluation revealed a C-reactive protein value of 170.5 mg/liter and a white blood cell count of 16,500/mm 3 . Lumbar puncture revealed turbid cerebrospinal fluid (CSF) with a white cell count of 750 cells/mm 3 with 83% polymorphonuclear leukocytes. Gram staining of CSF revealed very rare gram-positive diplococci. A latex particle agglutination test for the detection of bacterial antigen was done on the CSF with Wellcogen tests (Remel, Dartford, United Kingdom) and was negative for serogroup B Neisseria meningitidis, Escherichia coli K1, Streptococcus pneumoniae, Haemophilus influenzae b, and N. meningitidis serogroups A, C, Y, and W135. CSF parameters were as follows: glucose level of 2.6 mmol/liter, with serum glucose level of 16.6 mmol/liter and protein level of 1.14 g/liter. Based on these first results, and given the possibility of decreased susceptibility to penicillin of the presumed microorganism, empirical therapy, consisting of intravenous cefotaxime (300 mg/kg of body weight/day) and vancomycin (60 mg/kg/ day), was started. The CSF sample was cultured on Trypticase soy agar, Trypticase soy broth, Schaedler broth with vitamin K3 and 0.2% agar (bioMérieux, Marcy l'Etoile, France), and bloodchocolate agar incubated at 37°C in a 5% CO 2 atmosphere. Detection of microorganisms by PCR was not performed on this CSF sample. After 24 h of incubation, cultures of CSF yielded mixed growth of catalase-negative, gram-positive cocci and oxidase-positive, gram-negative diplococci. The two organisms were further identified as S. pneumoniae and N. meningitidis, respectively. The S. pneumoniae isolate was presumptively identified on the basis of the observation of an 18-mm-diameter inhibition zone around a 5-g optochin disk (Becton Dickinson, Sparks, Mass.) after incubation in an atmosphere of increased CO 2 . This identification was confirmed by using a DNA probe, the Accuprobe Streptococcus pneumoniae culture identification test (Gen-Probe; bioMérieux), according to the manufacturer's instructions. S. pneumoniae was shown to belong to se...