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#virology

A syringe is pictured on an illustration representation of COVID-19, the disease caused by the novel coronavirus in Paris on May 18, 2020. (Photo by JOEL SAGET / AFP)
A syringe is pictured on an illustration... […]

Vaccine innovation sparks hope, questions

Pfizer and BioNTech say their vaccine is 90% effective in preventing Covid-19 infections, but experts say the announcement raises many questions such as who it will protect and for how long?