As of August 30, the CDC has received reports of 12,908 severe breakthrough cases of Covid-19 among fully vaccinated people that resulted in hospitalization or death. For the more than 173 million people who were fully vaccinated by that date, that represents a less than a 1 in 13,000 chance of experiencing a severe breakthrough case of Covid-19. About 70% of breakthrough cases resulting in hospitalization were among adults 65 and older and about 87% of breakthrough cases resulting in death were among adults 65 and older…