Six new cases of blood clotting in Australia have been linked to AstraZeneca's coronavirus vaccine, according to the country's medical regulator.

The Therapeutic Goods Administration (TGA) on Thursday announced that one person in their 80s, two each in their 70s and 50s and one 18-year-old have developed thrombocytopenia syndrome (TTS) after receiving the AstraZeneca-Oxford vaccine.

It takes the total number of cases of clotting disorder linked to vaccines in Australia to 24.