Canada halts AstraZenica Vaccine due to new data from Europe that suggests the risk of blood clots is now potentially "as high as one in 100,000, much higher than the one in one million risk believed before."
"The blood clot typically happens between four and 20 days after getting the shot and the symptoms can mirror a stroke or a heart attack."

https://www.theepochtimes.com/canada-pauses-astrazeneca-vaccine-for-under-55_3753958.html