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and i'll come back to that, because china has a real problem with that for two big reasons. sinovac, which is their vaccine, is really not as effective as the mrna vaccines, especially in the elderly. so you've got a very big, vulnerable population to this new wave of infections. and people are very nervous that when you have this immunologically naive population, particularly older people, who are more likely to get infected and get severe consequences, that you are going to see a severe impact. the veteran american journalist barbara walters has died at the age of 93. born in boston, massachusetts, she was the first female co—presenter of a major network tv news programme in the united states. in a career that spanned five decades, walters won 12 emmy awards, 11 of those while working at abc news. tributes are already being paid to barbara walters on social media. dan rather, another leading us news broadcaster, tweeted: