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Fanny Gasser, a journalist for the Austrian daily newspaper Kronen Zeitung, told BBC News the school was likely unprepared for the possibility of an attack.

"Locally, we have seen people crying on the streets, talking to friends that have been at the school when the shooting happened, who have maybe lost a friend," said Fanny Gasser, a journalist for the Austrian daily newspaper Kronen Zeitung.

"The first vaccine an individual receives induces a strong primary immune response that shapes responses to subsequent infection and vaccination, an effect known as imprinting," said senior author Michael S. Diamond, MD, PhD, the Herbert S. Gasser Professor of Medicine.

"Understanding how viruses engage with the cells they infect is a critical part of preventing and treating viral disease," said co-senior author Michael S. Diamond, MD, PhD, the Herbert S. Gasser Professor at Washington University.

New Zealand's Olympic slopestyle champion Zoi Sadowski-Synnott took gold with 183.25, while Austria's Anna Gasser was third with 159.25.