Specializing in Canine and Feline Neurology and Neurosurgery for over 30 years
A virus is a minute infectious agent (about 100 times smaller than bacteria) that cannot be seen under a light microscope. They lack independent metabolism, are only able to replicate within the host cell, carry either DNA or RNA as their genetic material, and are protected by a protein coat. The body's immune system is usually able to eliminate harmful viruses and vaccines provide immunity to a particular viral infection. Antibiotics have no effect on viruses but antiviral medications suppress replication.