Austria was the first country in Western Europe to resume a lockdown, which is expected to last 20 days, and has said it will make vaccination mandatory from February.
City overcame last wave of infections and deaths in October and is trying to get back to normal. Government approved measures to replace state of emergency.
A new Ômicron variant of the coronavirus shakes markets, fearful that the strain could threaten the attempted economic recovery.
Prime Minister says the measures will be temporary, until experts have better understood the seriousness of the threat of the new variant.
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