Virion sizes typically range from ${}20\text{ nm}$ to ${}900\text{ nm}$, making them much smaller than cells. This difference is shown on a scale where a frog egg is ${}1\text{ mm}$, human eggs are ${}400\text{ }\mu\text{m}$, plant and animal cells are ${}10\text{ }\mu\text{m}$ to ${}100\text{ }\mu\text{m}$, red blood cells are under ${}10\text{ }\mu\text{m}$, mitochondria and bacteria are ${}1\text{ }\mu\text{m}$, smallpox is ${}500\text{ nm}$, flu virus is ${}100\text{ nm}$, polio virus is ${}50\text{ nm}$, proteins are ${}5\text{ nm}$ to ${}10\text{ nm}$, lipids are ${}1\text{ nm}$ to ${}5\text{ nm}$, and atoms are ${}0.1\text{ nm}$.