Relative Sizes of Bacteria and Viruses

This video provides a demonstration of the sizes of bacteria and viruses relative to human cells.

Scientists Richard Ganem and Brett Finlay use different common objects, such as balls and batteries, to illustrate the differences in size among bacteria, viruses, and mammalian cells.

These two clips are from a 1999 Holiday Lecture Series, 2000 and Beyond: Confronting the Microbe Menace.