July 4 this year could also be America’s Independence Day from Covid-19.

At current rates, America is administering nearly 2.8 million Covid-19 vaccine doses a day — roughly enough to vaccinate every adult (18 and older) in the country by July 4.

That would mean 80 percent of the population would be able to get a vaccine. We don’t know for certain if that’s enough for herd immunity, when enough of the population is immune to the disease, through vaccines or natural infection, that the virus can no longer sustain its spread. But it’s in the range that experts typically mention.

Since a vaccine isn’t yet approved for children younger than 16, this is also close to the highest level of vaccination we can expect for the time being. (The estimates in this story don’t include 16- and 17-year-olds who are eligible for vaccines.)