AstraZeneca manufacturing error clouds its COVID-19 vaccine study results Chicago TribuneAstraZeneca Faces Difficult Questions About Its Vaccine After Admitting Mistake The New York TimesVaccine 'hope' for Africa, but challenges remain ReutersAstraZeneca’s best COVID vaccine result was a fluke. Experts have questions Ars TechnicaAstraZeneca manufacturing error clouds vaccine study results SFGateView Full Coverage on Google News