How many people are now fully vaccinated against Covid in the U.S.? It is 15.8% of the total population of the U.S.

 fifty-one million eight hundred fifty-five thousand six hundred

However, since we also know that the present spreaders are between 16 and 40 the most, the people mostly vulnerable to Covid now will be between about 30 to 60 years old who haven't been Vaccinated yet.