Why "Coronavirus" is written without space? shouldn't it be "Corona virus"? [closed]

Names of viruses are often formed as single words with the suffix -virus. This is perhaps influenced by scientific use. There are rhinoviruses, noroviruses, adenovirus and so on. Again there isn't a logical rule, that is just how it is done. The virus that causes Ebola is known as ebolavirus (and note the downcasing when Ebola becomes a prefix) — ELL

Also, have a look at this Wikipedia article, almost all the names of viruses are one word.

For viruses that begin with a Greek letter, write it out and close up space between the letter and the rest of the word — CDC web

Betaherpesvirus

Edit: Suffix -virus: Used to form taxonomic names of genera of viruses — Wiktionary