1 Viruses are not alive: They do not have cells, they cannot turn food into energy, and without a host they are just inert packets of chemicals.
In 1981 Dean Koontz wrote a book “The Eyes of Darkness”. The chapter 39 it mentions a Chinese military lab outside of the city of Wuhan, where a deadly virus is invented as part of the country’s biological weapons warfare programme. Owing to the lab’s location, the virus is named ‘Wuhan-400’.
Some viruses are so large, other viruses infect them.