Tasmania's Health Department's appointing an expert panel to examine the case of a 70 year old man who has been hospitalised with suspected thrombosis seven days after receiving the AstraZeneca coronavirus vaccine.
The Therapeutic Goods Administration has found the Tasmanian case, together with 4 other new ones interstate are likely linked to the injection.
Most reactions have been minor, such as fever, soreness or nausea.
Therapeutic Goods Administration boss Professor John Skerritt admits rarely, they can be severe.
"We have identified five cases since we last stood up last week, five new cases of clotting and low platelets which we believe are likely to be linked to the AstraZeneca vaccine."
It is again being noted that this sort of serious reaction is rare and should not be a deterrent for being vaccinated.