User: Why is it that viruses are so small?
Assistant: The smallest known virus is the bacteriophage phiUser: Again.
Assistant: Sure, here's some more:
6. It’s about.1 micrometers in size. It is also the smallest virus known to infect bacteria. Phi6 has a protein coat that makes up about 50% of its total mass. It is also the smallest virus known to infect bacteria. Phi6 has a protein coat that makes up about 50% of its total mass.