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30.7 x 40.9 cm ⏐ 12.1 x 16.1 in (300dpi)
GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Intestinal bacterial flora. Illustration of bacteria forming part of the intestinal microbial flora. Some bacteria are non-pathogenic and form part of the normal bacterial flora found on human skin and in the human intestines. These 'good' bacteria help prevent harmful pathogenic (disease-causing) bacteria from taking hold and causing an infection.
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