WASHINGTON – The world is at risk of losing ground in the fight against Covid-19 because of the highly contagious Delta variant of the coronavirus, but vaccines remain the most effective weapon against it, the World Health Organisation (WHO) has warned.

WHO director-general Tedros Adhanom Ghebreyesus told a news conference that health systems in many countries were now being overwhelmed.

He said on Friday (July 30): “Hard-won gains are in jeopardy or being lost.”

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