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Streptococcus bacteria. Coloured scanning electron micrograph (SEM) of Streptococcus pneumoniae bacteria, a 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 infections of the lungs, often as a complication of another disease when the victim's immunity is compromised. Treatment is with antibiotics. Magnification: x6200 when printed at 10cm wide.
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