Christmas plans for many Americans now in disarray as United and Delta Air Lines say flight crews affected by Covid; AstraZeneca says three doses of its vaccine is effective against Omicron
Australians will soon be able to access Covid-19 vaccine booster shots four months after their second dose, then the wait will be shortened again.
The government has said the minimum interval will be cut from five to four months on 4 January, and reduced to three months on 31 January.
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