COVID-19 booster study

How does our immune system respond to different doses of booster vaccines?

The Murdoch Children's Research Institute is recruiting participants aged 18 years or older who have received two doses of either Pfizer or AstraZeneca COVID-19 vaccine and have not yet received a booster dose.

This study, in collaboration with the Coalition for Epidemic Preparedness Innovations (CEPI), aims to assess the immune responses of booster vaccines to obtain crucial information in designing optimal vaccine strategies in Australia and globally.

Participants will receive a standard or fractional (reduced) COVID-19 booster dose and will be provided with their antibody test results. This will show how their body's immune system responds to the vaccine.

See our website for more information


Please contact the study team at or phone 0456 433 655 with any questions.