DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Infected wound. Close-up of an infected wound from a thorn in the knee of a 59-year-old man. The infection has caused the skin around the wound to become red and swollen. At the centre of the wound (yellow) is pus composed mostly of dead infection-fighting white blood cells. Staphylococcus and Streptococcus bacteria are the most likely causes of this infection. Treatment is with appropriate antibiotic drugs.
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