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  1. E. coli bacteria, SEM
  2. Virus particles entering cells, artwork
  3. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  4. Bacterial Growth On Culture Media
  5. Cells from a urine infection, SEM
  6. Microscopic view of the common cold virus
  7. Microscopic view of rotavirus
  8. Scanning electron micrograph of HIV particles infecting a human T cell
  9. Bacteria infecting a macrophage, SEM
  10. E. coli bacteria, SEM
  11. Avian flu virus, TEM
  12. Syphilis bacterium (Treponema pallidum)
  13. Virus particles, artwork
  14. Viral throat infection, artwork
  15. Breast cancer cells, SEM
  16. Colorized scanning electron micrograph of filamentous Ebola virus particles
  17. Microscopic view of Penicillium expansum
  18. Cryptosporidiosis, TEM
  19. Microscopic view of Giardiasis
  20. Enterococcus faecalis bacteria, SEM
  21. Virus, artwork
  22. Escherichia coli bacteria, SEM
  23. Bacteria infecting a macrophage, SEM
  24. HIV particles, TEM
  25. Used interdental brush, SEM
  26. Petri dish bacterial cultures, picking a colony
  27. Bacterial lung infection
  28. Hepatitis C virus, molecular model
  29. Microscopic view of poliovirus
  30. Porphyromonas oral bacteria, TEM
  31. E. coli bacteria, SEM
  32. Artistic representation of the immune system's reaction to bacteria invading the tissues
  33. Gut bacterium, TEM
  34. AIDS pneumonia infection, TEM
  35. Antibiotic mechanism of action, artwork
  36. Microscopic view of a leukemia cell
  37. Group of Escherichia coli bacteria cells, known as E. Coli
  38. Group of H5N1 virus with glassy view
  39. E. coli bacteria
  40. Salmonella, TEM
  41. Marburg virus, TEM
  42. Bladder cancer cells dividing, SEM
  43. Gonorrhoea bacteria, TEM
  44. Microscopic view of Stachybotrys