Three pharmaceutical firms have formally registered their interest with the WHO, while two others are in preliminary discussions.
One of the three firms, CanSino, started submitting rolling data about its one-shot vaccine to the global health body this month, according to the WHO. Its vaccine has already been approved for use in mainland China after interim results showed it was 65.7 per cent effective.
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A new Covid-19 variant of significant concern has been identified in Victoria, with the new strain not linked to any of the cases in the state's current