White blood cell attacking Streptococcus pneumoniae bacteria, SEM
Coloured scanning electron micrograph (SEM) of Streptococcus pneumoniae bacteria (green) being attacked by a white blood cell (orange). S. pneumoniae is a leading cause of pneumonia, which particularly affects the young and old, or otherwise immunocompromised people. It also causes middle ear infections (otitis media). Antibiotics are typically used to treat these infections., by CDC, NIAID/SCIENCE PHOTO LIBRARY
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