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Available for over a year

Although vaccines will go a long way to reducing the number of cases of Covid, there’s still a need for other approaches. One of these could be an engineered biomolecule, designed by virologists Anne Moscona and Matteo Porotto, that blocks SARS-CoV-2 precisely at the moment it tries to enter cells in the nose and upper airways. Anne explains how this “molecular mask” would work. (Image: Illustration of a person using nasal spray, Credit: Getty Images.)