The timing of the event may matter too. A great deal of transmission seems to occur in the window of time after a person is infected but before they are symptomatic , according to a study in the journal Nature Medicine . A person attending an event within that period may create a super-spreading situation, whereas if they had attended just a few days before, they wouldn’t have. It's also possible that people with a higher viral load — which means they have more virus in their droplets than others — could make a person more likely to become a super-spreader, reports CNN.