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A University Had a Great Coronavirus Plan, but Students Partied On

Inquiry Begins Into AstraZeneca’s Vaccine Trial

E-Cigarette Use Falls Sharply Among Teenagers, C.D.C. Finds

How the Coronavirus Attacks the Brain

AstraZeneca Pauses Vaccine Trial for Safety Review

9 Drug Companies Pledge to ‘Stand With Science’ on Coronavirus Vaccines

How the Aging Immune System Makes Older People Vulnerable to Covid-19