This presentation by Dr. Andrew Kaufman explains how the Koch’s postulates and other means of defining viruses are not really fulfilled in this case: SARS-COV-2 has not been isolated, can’t be cultured, has not been used to reproduce any illness, as many researchers admit (clicking will download the pdf):

https://www.thelastamericanvagabond.com/wp-content/uploads/2020/05/Koch%E2%80%99s-Postulates-Dr.-Kaufman-5-4.pdf

https://everydayconcerned.net/2021/01/09/dr-mohammad-iqbal-adil-nhs-surgeon-fired-for-revealing-covid-19-is-not-a-real-disease-mere-cover-for-a-transhumanizing-sterilizing-gmo-vaccine/