Bacteria | Viruses |
Bacteria are living organisms. | Viruses are living inside the host cell while non-living outside the cell. |
They are comparatively larger in size, that is 1000 nm. | They are smaller in size, that is 20 to 200 nm. |
They do have ribosomes. | They do not have ribosomes. |
The infection is localized. | The infection is systemic. |