Version, say of a virus?

adjective

1. Manifesting variety, deviation, or disagreement

   "variant interpretations/opinions"

2. Varying usually slightly from a usual or standard form

   "variant readings"

3. Variable

noun

1. Someone or something that exhibits variation from a type or norm

   "Scientists now find that a variant of a specific gene may contribute to the disorder …"

2. One of two or more different spellings (such as labor and labour) or pronunciations (as of economics \ek-, ēk-\) of the same word
3. One of two or more words (such as geographic and geographical) or word elements (such as mon- and mono-) of essentially the same meaning differing only in the presence or absence of an affix

noun

1. A fatal prion disease that is held to be a variant of Creutzfeldt-Jakob disease caused by the prion associated with bovine spongiform encephalopathy and contracted by consuming infected beef or beef products

noun

1. A highly transmissible genetic variant of the SARS-CoV-2 coronavirus

   "Since the summer, independently owned restaurants and music venues in Colorado have instituted their own vaccine protocols in response to the spread of the highly contagious delta variant."

noun

1. Variant creutzfeldt-jakob disease

noun

1. An extremely transmissible genetic variant of the SARS-CoV-2 coronavirus

   "Although the omicron variant has now surpassed delta in the region, hospitals like St. Luke's are likely still treating people who have been infected by the delta variant."