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Streptococcus

A genus of gram-positive, coccoid bacteria whose organisms occur in pairs or chains. No endospores are produced. Many species exist as commensals or parasites on man or animals with some being highly pathogenic. A few species are saprophytes and occur in the natural environment.
(Source: National Library of Medicine 2013 MeSH Scope Note and Classification)

Images

Figure 1. Gram stain of sputum specimen, showing <i>Streptococcus pneumoniae</i>.

Figure 1. Gram stain of sputum specimen, showing Streptococcus pneumoniae.

Figure 2. <i>Streptococcus pneumoniae</i> on blood agar plate.

Figure 2. Streptococcus pneumoniae on blood agar plate.

Figure 3. Gram stain of cerebrospinal fluid, with Streptococcus Group B.

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References

National Library of Medicine 2013 MeSH Scope Note and Classification

National Library of Medicine MeSH Classification

'Bacteria

Gram-Positive Bacteria

Gram-Positive Cocci

Streptococcaceae

Lactococcus

Streptococcus

Streptococcus agalactiae

Streptococcus bovis

Streptococcus equi

Streptococcus gordonii

Streptococcus pneumoniae

Streptococcus pyogenes

Streptococcus suis

Streptococcus thermophilus

Viridans Streptococci