Mr Ong said 30 residents at NTUC Health Nursing Home in Geylang East, where a mobile vaccination team was deployed, also received their shots.
The teams “will continue to reach out to our seniors at home”, he added.
“To extend our reach, we are working with key agencies and stakeholders such as The People’s Association and the Silver Generation Office to engage, educate and encourage seniors to come forward for their booster doses.”
Around 140,000 seniors will be invited via SMS to book appointments for their booster dose at a vaccination centre, polyclinic or participating public health preparedness clinic.
Earlier on Wednesday, the Agency for Integrated Care said people aged 60 and above should minimise social interactions over the next two weeks amid a surge in COVID-19 community cases.
“Seniors are at a higher risk of developing serious health complications if they are infected with COVID-19,” said the agency.
The agency also urged all seniors and those living with them to take added precautions to protect themselves against the virus.