Inhaled vaccines under development in Hong Kong aim to fight coronavirus at its point of attack

The Covid-19 vaccines closest to the finish line are designed to be injected into the arm. Researchers are looking at whether they can get better protection from inoculations that fight the virus at its point of attack – the nose and mouth.Most vaccines in human testing require two shots for effectiveness, and developers still are not even sure if they will prevent infections. Scientists are hoping to generate superior immune responses with inhaled vaccines that directly target the airway cells…

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