Discrimination between Streptococcus pneumoniae and its close relatives of the viridans group is a common difficulty in matrix-assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry-based identification. In the present study, the performances of the Vitek MS MALDI-TOF mass spectrometry system were assessed using 334 pneumococci, 166 other S. mitis group streptococci, ...

From one strain of hemolytic streptococcus three forms were isolated, which produced three different degrees of hemolysis on the surface of blood agar in the presence of oxygen. The original form was moderately hemolytic; the glossy variant was more hemolytic than the original form; and the third form, obtained by passing the original culture through mice, was non-hemolytic. Under anaerobic con...

It is for this reason proposed to recognize endocarditis lenta as a Streptococcus viridans infection which may be divided into two groups. In the first the infecting organism can be recovered from the blood stream and pyrexia is present, while in the second the blood is sterile and the temperature remains normal; but the ultimate result, though longer delayed in the second, is almost equally di...

S CASE REPORT Synchronous subacromial and subdeltoid bursal abscess and pyomyositis of rotator cuff muscles caused by Viridans Streptococcus Sheng-Min Lan∗,§, Cheng-Li Lin∗ , ChienKuo Wang†, Sheng-Pin Lo‡, I-Ming Jou∗ & Wei-Ren Su∗ ∗Department of Orthopedics, National Cheng Kung University Hospital, Tainan, Taiwan †Department of Radiology, National Cheng Kung University Hospital, Tainan, Taiwan...

The efficiency of transformation of pneumococcus and a strain of viridans streptococcus (strain D) to streptomycin resistance is influenced by the species in which the mutation to resistance occurred, as well as by the species in which the mutated gene has been replicated. Pneumococcus and streptococcus strain D transform in higher frequency with DNA that has been replicated in bacteria of the ...

Eight cases of Streptococcus suis (S. suis) infection between 1993-1999 were retrospectively studied. There were 6 cases of meningitis and 2 cases of endocarditis. Acute meningitis with early sensorineural hearing loss was the characteristic feature and the most common presentation of S. suis infection. S. suis endocarditis is a rare presentation in Thailand. This organism was often mistaken fo...

BACKGROUND Despite advances in antimicrobial and surgical therapy, septic arthritis remains a rheumatologic emergency that can lead to rapid joint destruction and irreversible loss of function. In adults, Staphylococcus aureus is the most common microorganism isolated from native joints. Streptococcus gordonii is a prominent member of the viridans group of oral bacteria and is among the bacteri...

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