LETTER

Hippokratia 2013, 17(3):286

Meletis G1, Touliopoulou A2, Themelis P1
1
Department of Clinical Microbiology, 2Pediatrics Department, Veroia General Hospital, Veroia, Greece

 

Read PDF

Key words: Pneumococcosuria, child, female, dysuria, Streptococcus pneumoniae

Corresponding author: Meletis Georgios, Veroia General Hospital, Papagou District, Veroia, Greece,
tel: +306974282575, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Dear Editor,

Streptococcus pneumoniae is a notorious human pathogen causing pneumonia, meningitis, otitis media and septicemia. However, literature data about its isolation in urine samples of both adults1 and children2 are limited. We report here a case of S. pneumoniae isolation in a single urine sample of a 4-year old girl. The child presented to the emergency room of the pediatric clinic with dysuria and increased urinary frequency during the last 4 days. There was no fever, abdominal pain or macroscopic hematuria. There was no report of previous urinary tract infection, genitourinary abnormality or chronic kidney disease in her past medical history.  She had completed her vaccination for S. pneumoniae with 4 doses of the heptavalent pneumococcal conjugate vaccine at the age of 1.5 according to the national vaccination program. Clinical examination did not reveal any findings. The child had normal external genitalia and no tenderness at the palpation of the abdomen.

Microscopic examination of the urinary sediment revealed 4-6 polymorphonuclear cells and 0-1 erythrocytes/ optical field. Urine culture was performed on Columbia 5% horse blood agar and MacConkey agar plates. After overnight incubation, pure growth of small greenish colonies at a concentration of approximately 104 CFU/ml on blood agar was observed.  Gram stain of the isolate revealed Gram-positive lancet-shaped diplococci. Subculture onto chocolate agar and incubation at 37oC with 5% CO2 led to the growth of S. pneumoniae characteristic colonies surrounded by a zone of a-hemolysis. The microorganism was optocin sensitive and was later identified by Vitek 2 (bioMérieux, France) as S. pneumoniae. The automated system reported an “excellent identification”. The isolate was sensitive to oxacillin, ceftazidime, clyndamycin, levofloxacin, vancomycin and teicoplanin by the disc diffusion method.

The pediatrics department did not prescribe antibiotic treatment and suggested a second control visit after 4 days. At the second visit the symptoms were resolved and microscopic examination of the urinary sediment showed 0-1 cells/ optical field. Apart from urine, samples from the perineum, nose and pharynx were sent to the laboratory in order to check for the presence of pneumococci in other body sites. All cultures were performed onto chocolate agar plates and incubated at 37oC with 5% CO2 but resulted negative for S. pneumoniae.

Isolation of S. pneumoniae in urine samples is rare and its clinical significance is questioned. Furthermore, the medium and CO2 concentrations necessary for its growth are not applied routinely for urine cultures. Cases of certain urinary tract infections have been reported; they considered however children with chronic kidney disease.3 In the only to date large scale study, the authors concluded that the presence of S. pneumoniae in the urine of children is to be attributed to perineal contamination.2 Even though we were not able to isolate pneumococci from other body sites, we postulate that our finding could possibly be attributed to hand contamination from the perineum or the nasopharynx.

References

1. Nguyen VQ, Penn RL. Pneumococcosuria in adults. J Clin Microbiol. 1988; 26: 1085-1087.
2. Miller MA, Kaplan BS, Sorger S, Knowles KF. Pneumococcosuria in children. J Clin Microbiol. 1989; 27: 99-101.
3. Burckhardt I, Zimmermann S. Streptococcus pneumoniae in urinary tracts of children with chronic kidney disease. Emerg Infect Dis. 2011; 17: 120-122.