supplier of covid vaccines to much of the developing world, johnson & johnson, quietly shutting down a plant overseas, amid growing concern that the virus will continue to -- mutate, especially if developing countries do not have access to the vaccine. j&j says it continues to manufacture its vaccine around the clock and around the world. it all comes as omicron sub variant ba. 2, even more transmissible than the original highly contagious mutation, now accounts for nearly 4% of new cases in the u.s.. >> even if the united states is highly vaccinated, if other countries remain unvaccinated, that adds two variants that can accumulate and cause us to have surges. >> but tonight it is a turning point for the u.s., where cases are down 65%. several states announced a plan to end mask mandates, among them california, we are effective a week from today, mandates for the vaccinated will be lifted, though counties like los angeles and san francisco say that masks will