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Streptococcus bacteria. Light micrograph of Gram-stained Streptococcus pneumoniae bacteria (also known as S. pneumococcus). These Gram- positive rounded (cocci) bacteria often occur in chains, as here. Although often found living harmlessly in the body, S. pneumoniae can produce dangerous opportunistic pneumonia infections, often as a complication of serious disease when the patient's immune system is compromised. Magnification: x1450 when printed 10cm wide.
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