The term 'Virus Variety' can be summarized by the crossword solution 'STRAIN, ' which is a six-letter word. A STRAIN is a specific type of virus, and it is often used to refer to a particular variety of a virus that has been isolated from other varieties. Strains are typically identified by their genetic makeup, and they can vary in terms of their severity and the symptoms they cause. Strains of a virus can also be used to track the spread of the virus, as different strains may have different levels of prevalence in different areas.