Bacteria can get into the body of any living thing and can cause it to get sick. Once inside the body the bacteria will reproduce or make clones to fight the healthy bacteria born in our body.
Viruses depend on the host cells that they infect to reproduce. ... An infected cell produces more viral protein and genetic material instead of its usual products. Some viruses may remain dormant inside host cells for long periods, causing no obvious change in their host cells (a stage known as the lysogenic phase).
