WHO Continues To Recommend Astrazeneca Vaccine Use Despite European countries suspending AstraZeneca jab, WHO's chief scientist recommends countries continue using it. Although several more countries have suspended AstraZeneca vaccines' use as a precautionary measure, it does not necessarily mean these events are linked to vaccination, the World Health Organization (WHO) head said Monday. "Several more countries have suspended the use of AstraZeneca vaccines as a precautionary measure, after reports of blood clots in people who had received the vaccine from two batches produced in Europe," said WHO director-general Tedros Gebreyesus. "This does not necessarily mean these events are linked to vaccination, but it's routine practice to investigate them, and it shows that the surveillance system works and that effective controls are in place," he said, speaking at a twice-weekly WHO webinar.