We recently described the novel species Streptococcus tigurinus sp. nov. belonging to the Streptococcus mitis group. The type strain AZ_3a(T) of S. tigurinus was originally isolated from a patient with infective endocarditis. According to its phenotypic and molecular characteristics, S. tigurinus is most closely related to Streptococcus mitis, Streptococcus pneumoniae, Streptococcus pseudopneum...

Methanobrevibacter oralis, an anaerobic methanogenic archaeon, has been previously isolated from the human oral cavity. Here, sequencing a stool isolate (strain JMR01) yielded a 2.065-Mb genome with a 27.78% G+C content containing a total of 2,042 open reading frames and 3 clusters of regularly interspaced short palindromic repeat (CRISPR) loci with associated Cas proteins.

Streptococcus tigurinus is a newly described member of the Streptococcus mitis group. Due to the difficulty in distinguishing viridans group streptococci (VGS) by phenotype, analysis of 16S rRNA sequences is necessary for the accurate identification of most species. Through a laboratory policy of analyzing all clinically significant isolates from the VGS group by16S rRNA gene sequencing, we ide...

OBJECTIVES Tn916-like elements are one of the most common types of integrative and conjugative element (ICE). In this study we aimed to determine whether novel accessory genes, i.e. genes whose products are not involved in mobility or regulation, were present on a Tn916-like element (Tn6087) isolated from Streptococcus oralis from the human oral cavity. METHODS A minocycline-resistant isolate...

The antigenically related coaggregation receptor polysaccharides (RPS) of Streptococcus oralis strains C104 and SK144 mediate recognition of these bacteria by other members of the dental plaque biofilm community. In the present study, the structure of strain SK144 RPS was established by high resolution NMR spectroscopy as [6Galfbeta1-6GalNAcbeta1-3Galalpha1-2ribitol-5-PO(4)(-)-6Galfbeta1-3Galbe...

A 39-year-old male with a history of cocaine abuse presents to the emergency room with pain in the right leg and fever (39oC) 6 days after injecting himself in the thigh with midazolam pills diluted in tap water to control symptoms of withdrawal. Physical examination revealed rubor, swelling and tenderness of the thigh without crepitation, suggestive of cellulitis. Laboratory findings consisted...

Despite the benefits of MALDI-TOF MS technology (Matrix-Assisted Laser Desorption-Ionization Time-Of-Flight Mass Spectrometry) reported worldwide and the continuous improving of the available databases, discrimination between Streptococcus pneumoniae and closely related species within the Streptococcus mitis group (SMG) using this methodology has been suboptimal. However, the accurate identific...