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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. Avian flu virus, TEM
  11. E. coli bacteria, SEM
  12. Virus particles, artwork
  13. Viral throat infection, artwork
  14. Breast cancer cells, SEM
  15. Colorized scanning electron micrograph of filamentous Ebola virus particles
  16. Microscopic view of Penicillium expansum
  17. Cryptosporidiosis, TEM
  18. Microscopic view of Giardiasis
  19. Virus, artwork
  20. Enterococcus faecalis bacteria, SEM
  21. Escherichia coli bacteria, SEM
  22. Bacteria infecting a macrophage, SEM
  23. Used interdental brush, SEM
  24. HIV particles, TEM
  25. Bacterial lung infection
  26. Petri dish bacterial cultures, picking a colony
  27. Hepatitis C virus, molecular model
  28. Microscopic view of poliovirus
  29. Syphilis bacterium (Treponema pallidum)
  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. Antibiotic mechanism of action, artwork
  35. AIDS pneumonia infection, TEM
  36. Group of Escherichia coli bacteria cells, known as E. Coli
  37. Microscopic view of a leukemia cell
  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. Microscopic view of Stachybotrys
  44. Gonorrhoea bacteria, TEM