LONDON — High-income countries have adopted an approach akin to the "rule of the jungle" when it comes to securing supplies of prospective coronavirus vaccines, according to an expert in global health, governance, and infectious diseases.

It is likely to have significant repercussions for the volume of vaccines available for low-income countries in the coming months, Suerie Moon, co-director of the Global Health Centre at the Graduate of Institute of Geneva, told CNBC Monday.

There is growing optimism that a coronavirus vaccine could help bring an end to the coronavirus pandemic that has claimed over 1.31 million lives worldwide.

Moderna said Monday that preliminary late-stage trial data showed its vaccine was more than 94% effective in preventing Covid-19. Last week, Pfizer and BioNTech said an early analysis of their vaccine candidate showed it was over 90% effective in preventing coronavirus infections.

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