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Available for over a year

Did Donald Trump turn to China for help in his bid for re-election later this year? That's what his former ally John Bolton says in his new book out next week; does being infected with Covid-19 make you immune once you've had it? Recent research suggests it doesn't always. So who becomes immune and who doesn't?; and a Â鶹Éç investigation looks at how the coronavirus has caused more deaths than reported.