GENEVA (AP) — A top World Health Organization expert on vaccines says people should feel reassured that even if health authorities turn up a link between blood clots and the AstraZeneca vaccine, such cases are “very rare.” Dr. Kate O’Brien says WHO and the European Medicines Agency are trying to investigate the possibility of a link between blood clots and the AstraZeneca shots. The potential side effect has prompted some countries to temporarily suspend use of the AstraZeneca vaccine. O’Brien said during a news conference today that the current “benefit-risk assessment” is for countries to continue giving the vaccine. Both WHO and the European agency are expected to present updated recommendations today or tomorrow.