News AstraZeneca vaccine vindicates delaying second dose; deaths, new infections decline: Latest COVID-19 updates February 3, 2021February 3, 2021 Elinor Aspegren, USA TODAY Comments Off on AstraZeneca vaccine vindicates delaying second dose; deaths, new infections decline: Latest COVID-19 updates AstraZeneca's vaccine appears to provide strong protection 3 months after just one dose while also curbing spread of infections. Latest COVID-19 news.