General practitioners will be able to offer patients the Pfizer vaccine from today in the latest boost to Australia's COVID-19 vaccine rollout. Around 500 GPs across the country will start administering the Pfizer vaccine to those aged between 40-59 from this week. A further 800 GPs are expected join the next phase of the rollout later this month and into August. READ MORE: A nurse shows a vial of the Pfizer-BioNTech COVID-19 vaccine at the Molinette hospital in Turin.(Diego Puletto/Getty) Despite the step forward in the rollout, GPs have expressed concern over the supply of the Pfizer vaccine. "There is a lot of concern about the Pfizer vaccine but it has been made clear that this month there should be 2.8 million doses available," Infectious disease expert Professor Sanjaya Senanayake told Today.