Covid-19 vaccines and boosters continued to have very high efficacy against severe outcomes during the Omicron wave of the virus, a large real-world study from the US Centers for Disease Control and Prevention (CDC) showed Friday. The paper evaluated data from more than 300,000 visits to emergency departments, urgent care clinics, and hospitalizations across 10 states from August 26, 2021 to January 5, 2022. During the period when the Delta variant was dominant, vaccine efficacy […]