mark, thanks. vaccinations are already under way in the u.k. cbs senior foreign correspondent liz palmereports. >> reporter: good morning. as the u.s. prepares to start vaccinating its citizens, a program that began here in the u.k. on monday in 50 hospitals, apart from a couple of temporary allergic reactions, has gone without a hitch. 90-year-old margaret keenan was first. with no report she suffered any side effects. >> it is just so strange and so wonderful, really. >> reporter: by the end of the week, tens of thousands had been done. the u.k. had asked retired nurses to return to work to help inoculate the initial batch of 400,000 people. first the very elderly, and also frontline medical staff. in place and working well is a complex transport system to keep the pfizer vaccine at sub-zero cold, until it is ready to be used. in asia, another vaccine is making its widespread debut. china's version, pairs the first load of a million doses arriving in indonesia, which has just suffered its most lethal covid week. russia, too, is sharing its vaccine, and it arrived in serbia this week. t