Than viruses, or at least 1 micrometer (1 millionth of a meter) long.
To reproduce they need to commandeer the machinery of the cells they invade. They have so few genes and proteins of their own that in order VIRUSES are the smallest of all infectious agents, averaging about 100 nanometers.The approximate sizes of microbes can be approximated by using the following rule of thumb:
Show us a teeming microbial world that we could barely imagine without their help. Using microscopes of varying power, photographers The Parasite Picture Gallery - Life cycles of several very common parasitesĪn extraordinary variety of viruses, bacteria, parasites, and organisms stand ready to attack us and feed
