“Effective” needs to be defined, I think. For example, the J and J vaccine is supposedly less effective than Pfizer and Moderna. Yet in their trial , zero people get seriously ill or died . So you had 100 percent effectiveness in no deaths and 100 percent effectiveness in preventing people from becoming seriously ill. So if my risk is I get symptoms of a flu or cold but I don’t end up in the hospital ,I’ll take it..i