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.
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Figure 2. <i>Streptococcus pneumoniae</i> on blood agar plate.
Figure 2. Streptococcus pneumoniae on blood agar plate.
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Figure 3. Gram stain of cerebrospinal fluid, with Streptococcus Group B.
Figure 3. Gram stain of cerebrospinal fluid, with Streptococcus Group B.
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References
  1. National Library of Medicine 2013 MeSH Scope Note and Classification