@@shomusbiologyofficial Either you're lying, didn't do your homework on covid-19 or simply don't know what you're talking about. Covid-19 most certainly doesn't not meet ANY of Koch's 4 postulates.
Covid is a virus. Koch’s postulate only works for (most) bacteria (viruses were not know in Koch’s time) There are other methods for determining causality in viruses which have definitively shown it cause disease.