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The six reported cases developed symptoms between four and 26 days after vaccination.
“The VSIG concluded that the events were TTS,very likely linked to vaccination because of the consistency of the cases with the current working case definition for TTS,and the absence of known alternative risk factors and causes for the events,” the TGA said.
“However,further follow-up of some remaining details,including information about the patients’ medical histories,and some imaging and blood test results,is still being completed.”
One of the new cases included a blood clot in one of the sinuses in the brain,presenting as a headache,nosebleed,nausea and vomiting.
The other two cases involved more common sites for blood clots:in one case a deep vein thrombosis in the calf,which presented as leg pain nine days after vaccination,and in the other a deep vein thrombosis in the upper leg.
To date,about 1.1 million doses of the AstraZeneca vaccine have been administered in Australia.
“The overall number of reports received for blood clots following vaccination so far has been no higher than the expected background rate for the more common type of blood clots in Australia,” the TGA said.
“These can occur in around 50 Australians every day separate to vaccination and are not related to the rare TTS clotting disorder.”
No cases of TTS associated with the Pfizer vaccine have been detected in Australia.