Slow pace of deliveries has angered European officials, who are holding the pharmaceutical company responsible for partly delaying their immunization rollout

Nachman Ash says that while it is expected Israelis will need further shots for protection against COVID, the timeframe is still unclear

Ten million doses were ordered, but officials now wary amid blood clot fears; legal authorities looking at reselling units to other countries

Health authorities say 'no safety concerns' for study participants while organizers await data, in latest drama over embattled vaccination

Though very uncommon, the unique type of thromboses seen in dozens who got the shot has experts paying attention; some are urging caution, while others say tiny risk is worth it

Decision follows reports of a small number of unusual blood clots in people who received shot, in latest setback for vaccine seen as crucial for Europe, global inoculations

British-Swedish drugmaker's discrepancies in data, failure to communicate with American authorities, dosing mistakes are blamed for distrust

US federal health officials concerned company may have provided an incomplete view of efficacy data; FDA to rule on authorization in coming weeks

Drugmaker says long-awaited vaccine data shows 79% efficacy overall and that it works for all ages, including older people, as it seeks US FDA approval for emergency use

Note of optimism with 'symbolic date' comes as incoming shipments of vaccines expected to speed up continent's sluggish rollout