BSIP / SCIENCE PHOTO LIBRARY BSIP / SCIENCE PHOTO LIBRARY
Streptococcus bacteria. Coloured scanning electron micrograph (SEM) of Streptococcus pneumoniae bacteria (also known as S. pneumococcus), a cause of pneumonia. 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 victim's immunity is compromised. Magnification: x7800 at 35mm size.
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