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COVID-19 / How are adverse reactions to vaccination monitored?
« on: 15/03/2021 10:09:35 »
A couple of weeks ago a friend in previously good health had a stroke caused by a blood clot in the brain. It occurred a couple of weeks after receiving the Oxford vaccine. Another friend suggested a connection but the rest of us felt sure it was a coincidence. However, it has caused me to take a particular interest in the recent reports coming out of Norway about blood clots in the brain following vaccination.
It is reassuring that AstraZeneca claim they have not seen abnormal levels of clotting amongst vaccine recipients but I am wondering how the so called 'yellow card' system for reporting possible adverse events works. Would a clinician automatically make a yellow card report for a stroke or clotting event that occurs shortly after vaccination or would they make their own judgement whether it was likely to be coincidence? It seems to me that if clinicians do not report all such events then evidence of any problem is going to be hidden by under reporting.
It is reassuring that AstraZeneca claim they have not seen abnormal levels of clotting amongst vaccine recipients but I am wondering how the so called 'yellow card' system for reporting possible adverse events works. Would a clinician automatically make a yellow card report for a stroke or clotting event that occurs shortly after vaccination or would they make their own judgement whether it was likely to be coincidence? It seems to me that if clinicians do not report all such events then evidence of any problem is going to be hidden by under reporting.