What makes you think there isn't?
Ok, 1 Ozzy who went home sick vs 1 asymptomatic that you were around the entire week. Which person gave you covid?
My "made up" scenario is a very realistic possibility that displays the law of probabilities. If you spend much more time around an asymptomatic person, which is much more likely to happen because neither of you realize that person has it. It stands to reason you have as good a chance at contracting covid from that person as you would if you spent a brief amount of time with someone who was symptomatic. That is extremely simple deductive reasoning.