Federal Health Minister Greg Hunt has been admitted to hospital, his office has confirmed.
Mr Hunt is suspected to have an infection and is being kept overnight for observation.
The 55-year-old has been given antibiotics and fluid as a precaution and is expected to make a full recovery, his office said in a statement.
Mr Hunt and Department of Health secretary Brendan Murphy were among the first to receive the AstraZeneca COVID-19 vaccination at a Melbourne clinic on Sunday.
“His condition is not considered to be related to the vaccine,” his office said in a statement.
After receiving the vaccine Mr Hunt spoke about its importance.
“Vaccinations save lives and protect lives,” Mr Hunt said.
“Whether it’s smallpox, measles, mumps, rubella, hooping cough, influenza, and now COVID-19, vaccinations can save lives and protect lives.”
Mr Hunt is responsible for federal health issues including the rollout of the vaccine in aged care facilities. He is also the Aged Care Minister.
He has served as Federal Health Minister throughout the coronavirus pandemic, having stepped into the role in 2017.
Mr Hunt is the third Morrison government minister to take leave due to health issues.