<human>: What is the difference between a virus and an infection?
<bot>: The main difference between a virus and an infection is that a virus is an infectious agent that requires a living host to replicate, while an infection is caused by an external source such as bacteria or fungi. A virus typically contains genetic material surrounded by a protein coat called a capsid, which allows it to enter and infect cells. An infection can also be caused by other viruses or bacteria that cause disease.