The vaccines currently used in Australia have been rigorously tested for safety and are highly effective.
A very rare but serious new side effect has emerged with the AstraZeneca vaccine - a blood clotting syndrome called thrombosis in combination with thrombocytopenia, or TTS.
TTS is extremely rare. It's also new, and was not found in the clinical trials for the AstraZeneca vaccine.
Evidence shows that TTS is less likely in older adults. And they have a higher risk of getting very sick if they get COVID-19.
That is why the vaccine preferred for you has changed, depending on your age. COVID-19 can spread quickly and widely and has resulted in the deaths of millions of people worldwide.
Vaccination is the most effective way to protect ourselves and our community against COVID-19. To learn more visit health.gov.au