and mexico during her visit. >> sreenivasan: carrie kahn, international correspondent for npr, joiningo city. thanks so much. >> you're welcome. >> sreenivasan: the covid-19 pandemic is slowing in most the world, but restrictions remain as new cases d variants of the coronavirus continue to infect hundreds of thousands of people every day. in the u.k., a variant that first emerged in india-- now called t delta variant-- may delay the lifting of all restrictions planned for june 21. the country's health secretary said today that the variant is 40% more transmissible, but that vaccines are working. >> the majority of people going into hospital with covid now are unvaccinated. and that is obviously... that's a challenge for them. but it's good news for all of us, because it shows that the ccine protects you from going into hospital. >> sreenivasan: in taiwan today, three u.s. senators arrived for meetings and announced that the u.s. will send 750,000 doses of vaccines to taiwan. the country has complained that china is blocking access to vaccines. worldwide,he "new york times" database sh