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Less than 1% of fully vaccinated people experienced a breakthrough infection, according to a Kaiser Family Foundation analysis of official state data.   The federal government only reports data on breakthrough infections that result in hospitalization or death.   According to the latest data from the US Centers for Disease Control and Prevention, less than 0.004% of people who have been fully vaccinated against Covid-19 experienced a breakthrough case resulting in hospitalization, and less than 0.001% have died from the disease. That’s about 6,600 severe breakthrough cases out of more than 163 million fully vaccinated people.   But the KFF analysis shows that breakthrough infections of any kind are also extremely rare.   About half of states report data on Covid-19 breakthrough cases, and in each of those states, less than 1% of fully vaccinated people had a breakthrough infection, ranging from 0.01% in Connecticut to 0.9% in Oklahoma.   Also, more than 90% of cases – and more than 95% of hospitalizations and deaths – have been among unvaccinated people, according to the KFF analysis. In most states, more than 98% of cases were among the unvaccinated.