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  1. Cells from a urine infection, SEM
  2. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  3. Bacteria infecting a macrophage, SEM
  4. Microscopic view of the common cold virus
  5. Virus particles, artwork
  6. E. coli bacteria, SEM
  7. Breast cancer cells, SEM
  8. Colorized scanning electron micrograph of filamentous Ebola virus particles
  9. Cryptosporidiosis, TEM
  10. Microscopic view of Giardiasis
  11. Enterococcus faecalis bacteria, SEM
  12. Used interdental brush, SEM
  13. Bacterial lung infection
  14. Hepatitis C virus, molecular model
  15. Artistic representation of the immune system's reaction to bacteria invading the tissues
  16. Group of Escherichia coli bacteria cells, known as E. Coli
  17. Group of H5N1 virus with glassy view
  18. Salmonella, TEM
  19. Bladder cancer cells dividing, SEM
  20. Microscopic view of Stachybotrys