this is nbc nightly news with lester holt. good evening we have been under an avalanche of confusing information about covid vaccines and booster shots led by the white house s premature push for those extra shots for everyone to start today. that s not happening today, johnson & johnson did become the latest vaccine maker to claim an extra dose increases effectiveness. in j&j s case, 94% compared to 70% for a single shot. but they still have to submit more data to regulators even friday s endorsement by an fda advisory panel of pfizer booster shots for older americans has still not been formalized, leaving most of the 182 million fully vaccinated americans still waiting for what s hoped to be extra protection from covid. stephanie gosk sorts it out for us. reporter: good news today for people who received the single dose johnson & johnson vaccine. the company says new data shows it is holding up against covid-19 variants and j&j says a booster could do even more if giv
But confusion mounting who is eligible for boosters and when? breaking news, the autopsy results in confirming remains found in wyoming are of the missing woman, gabby petito her death ruled a homicide as authorities return to a wildlife refuge, the search for her fiance who vanished a week ago. also president biden hosting uk prime minister boris johnson at the white house late today, hour after his address to the united nations his message of unity at a time of rising tension with allies, what he said in defense of the chaotic u.s. withdrawal from afghanistan. the president also vowing to get the crisis at the border under control as outrage grows over these images, border agents on horseback confronting migrants word tonight tens of thousands more may be on the way the faa calling for a crackdown on unruly passengers, what it is giving the airlines a week to do. and a race against time to save the world s largest tree