"As part of its pandemic response, NSW Health is taking this important temporary measure to also give us the best chance of containing the current outbreak in Greater Sydney as quickly as possible," a spokesperson for NSW Health said.

As a result, people in other regions could receive a notice advising their first dose of Pfizer will be rescheduled.

Anyone who has had their first dose already or those in priority groups 1a or 1b will not have their bookings rescheduled.

GPs continue to supply Pfizer vaccinations in regional NSW, and their supplies from the federal government are unaffected by this reallocation.

AstraZeneca also remains available from GPs, NSW Health clinics and a growing number of pharmacies.

The NSW government has asked the federal government to facilitate more pharmacies in regional and rural areas delivering the COVID-19 vaccines.

Public health advice, based on the latest information from the Australian Technical Advisory Group on Immunisation (ATAGI), now recommends that all individuals aged 18 years and over in NSW, including adults under 60 years of age, should consider getting vaccinated with any available vaccine, including AstraZeneca.

NSW Health has also authorised pharmacists to offer AstraZeneca vaccination to anyone aged 18 years or over without precautions or contraindications who has had the opportunity for a discussion in relation to the risks and benefits of vaccination, and has provided fully informed consent.

"We apologise for the inconvenience and thank you for your patience. As people are contacted they will be provided with information about the rescheduling of their bookings," the spokesperson said.

You can check for available GP appointments, via the Australian government eligibility checker at www.health.gov.au/resources/apps-and-tools/covid-19-vaccine-eligibility-checker.