A nasal spray Covid-19 vaccine being developed by the University of Hong Kong could be available on the market in two to three years, one of its researchers has said, with ongoing clinical trials so far showing the product to be safe. Professor Ivan Hung Fan-ngai, a member of the HKU team working on the vaccine, said more than 10 people had taken part in phase one of the trial.“So far, we’re seeing that the vaccine is very safe. We’re following up on the level of antibodies being generated,” he…


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