Penicillin-resistant Aerococcus viridans bacteremia in a child receiving prophylaxis for sickle-cell disease.
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16S rRNA gene sequencing studies were performed on some unusual gram-positive catalase-negative cocci of unknown taxonomic position isolated from human clinical sources. Comparative analysis of the sequence data demonstrated that the clinical isolates represent a hitherto-unknown line of descent within the low-G+C-content gram-positive bacteria. On the basis of the phylogenetic findings and the phenotypic distinctiveness of the organisms, it is proposed that they be classified in a new genus, Helcococcus, as Helcococcus kunzii sp. nov. The type strain of H. kunzii is NCFB 2900.
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Actinobaculum was isolated from urine only after prolonged incubation in 5% CO(2) after discrepancy between urine Gram stain and initial culture results was observed. Additional patients were diagnosed using this method. The prevalence of Actinobaculum species in urinary tract infections is underestimated since it is not isolated by routine urine culture procedures.
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On the basis of experiments carried out in the course of this study the conclusion can be made that one of the mechanisms of the preventive effect of aerococci, the representatives of the indigenous microflora of the gastrointestinal tract, lies in their capacity for adhesion to and colonization of the mucous membrane, this enhancing the resistance of the enteric tract to infections. These properties of anterococci substantiate good prospects of using M-bacterin (live lyophilized aerococcal culture) for the control of enteric infections and dysbacteriosis.
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