and on "world news tonight" next tuesday and wednesday night. we'll see you then. but the news does continue tonight and we move on now to the other major headlines. the coronavirus here in the u.s. the vaccinate rate is slowing down. so, will the u.s. meet that fourth of july goal? 13 states have reached that benchmark. 70% of adults with at least one dose. at the other end of the scale, six states are at less than 50%. mississippi, the lowest of all at 44% of adults with one shot. and dr. jha with us right here tonight on the concerning delta variant, first seen in india, now the dominant strain in the uk. it's being seen here in the u.s. already. the doctor here on the big difference on how effective the vaccines are against this variant after one dose and then after two doses of the vaccine. marcus moore from mississippi tonight. >> reporter: tonight, with vaccine demand slowing in the u.s., news that millions of unused johnson & johnson one-dose vaccines are due to expire at the end of the month. the company, which suffered