>> reporter: china's expected to keep a strict pandemic border control in place for another year. that would mark nearly two years that china's borders have been essentially sealed off according to t"the wall street journal" which cites people familiar with the matter. it would mean travel in and out of the country would remain limited to certain visas and covid-19 protocols such as chinese vaccinations. the country aims to prevent any further outbreaks especially before it becomes the world stage for the 2022 beijing winter olympics. >> reporter: i'm nina del santos, and the part of the first and second doses. merkel was inoculated with the astrazeneca vaccine but then later on followed up with a second shot this time made by moderna. it's not yet clear whether the european agency condones the mixing and matching by different manufacturers like this. in the uk there's a big study