Streptococcus bacteria. Coloured scanning electron micrograph (SEM) of Streptococcus pneumoniae, the cause of pneumonia. These Gram-positive oval- shaped bacteria often occur in short chains, as seen. Although found living harmlessly in the body, S. pneumoniae, also known as S. pneumococcus, can cause dangerous opportunistic pneumonia infections, often as a complication of serious disease when the victim's immunity is compromised. Magnification unknown.
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