Thailand has delayed the rollout of the AstraZeneca's Covid-19 vaccine over reports of blood clots, despite there being no evidence of a link to the jab.The country's prime minister was due to kick off the country's vaccination drive by getting the vaccine on Friday. This has now been cancelled.The delay comes after a number of countries, including Denmark and Norway, suspended the use of the jab.Around 5 million Europeans have already received the AstraZeneca vaccine.Thailand's public health ministry said it made the decision because the country had not been "hard hit" by the virus and it had other vaccines it could rely on in the meantime.There have been about 30 cases in Europe of "thromboembolic events" - or developing blood clots - after the vaccine was administered.On Friday, Bulgaria became the latest country to suspend use of the vaccine, and it asked for a written statement from the European Medicines Agency (EMA) accounting for the jab's safety.The EMA said on Thursday that there was no indication the jab was causing the blood clots, adding that its "benefits continue to outweigh its risks".