The experimental vaccine ZF2001 produced antibodies in at least 93 per cent of participants who received three doses, researchers said. Photo: EPA-EFE China / Science Covid-19: fifth Chinese vaccine to reach final trials ‘produces antibodies’ Phase 1 and 2 trials indicate the candidate is safe and immunogenic, but further trials needed to test its efficacy, researchers say It uses ‘protein subunit’ method, already used in vaccines for hepatitis B and acellular pertussis…

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