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Past election campaign posters featuring Left Party leader Nooshi Dadgostar in central Stockholm, Sweden, on September 7, 2026. [AFP]

Sweden votes Sunday in a tight general election that could see the left-wing opposition oust the government after a campaign dominated by concerns over healthcare and the welfare state amid fears over Europe's security.

Opinion polls have pointed to a victory for the centre-left opposition headed by the Social Democrats.

But Prime Minister Ulf Kristersson's centre-right coalition and its parliamentary ally, the anti-immigration Sweden Democrats, have narrowed the gap in the final weeks of campaigning and the election could go down to the wire, experts say.