Coinspeaker Pharmaceutical Giant AstraZeneca Resumes Clinical Trials for COVID-19 Vaccine, AZN Stock Slightly UpIn partnership with U.K.'s Oxford University, AstraZeneca said that it will resume the phase three clinical trial for its COVID-19 vaccine contender AZD1222 since it got an approval from UK's Medicines Health Regulatory Authority. Pharmaceutical Giant AstraZeneca Resumes Clinical Trials for COVID-19 Vaccine, AZN Stock Slightly Up