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