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Australians over the age of 18 are eligible for booster doses five months after their second dose now the federal government has expanded the vaccine program.
Moderna also joins Pfizer as a preferred vaccine for booster doses.
How do the boosters work? What level of protection will they offer against the emerging Omicron variant?
Today on Please Explain, reporter Sherryn Groch joins Bianca Hall to discuss how boosters work and why vaccinating developing countries will be crucial in countering new variants of coronavirus.
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