Structure
Viruses are very small (about 0.0001mm). They are made of DNA protein. They are not cells - they don’t have a nucleus and can’t reproduce on their own. It has a head and protein tail fibers to support it.
Cures
They can be fought off by the immune system in the body and vaccines, but antibiotics have no effect on them. the main cure is vaccines.
Example
COVID-19, measles, influenza
How It Can Be Transmitted
Viruses can be transmitted by blood, faeces or through the air.