Even with the rampant development of new COVID-19 vaccines, the world will fail to end the pandemic unless every single country receives doses in a fast and fair manner, disease experts warned Saturday.

As several nations have been jumping on the idea to implement vaccine passports when international travel resumes, the authors of an open letter published in The Lancet medical journal said vaccine stockpiling in wealthier countries would only prolong the global health emergency, AFP reported.

The experts warned against “vaccine nationalism” and said it could disrupt the Covax initiative aimed at getting vaccines to low and middle-income countries and lead to huge dosage shortfall for several years to come.

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“The stark reality is that the world now needs more doses of COVID-19 vaccines than any other vaccine in history in order to immunise enough people to achieve global vaccine immunity,” said lead author Olivier Wouters from the London School of Economics and Political Science, AFP reported.

“Unless vaccines are distributed more equitably, it could be years before the coronavirus is brought under control at a global level.”

Even with more than two dozen COVID-19 vaccines either in developmental phase or approved for use, lower-income countries are still struggling with the enormous logistical challenges to procure immunisations and deliver them to populations.

These include a lack of funds to purchase vaccines, as well as poor infrastructure to transport and store them — especially since the mRNA vaccines on the market currently need to be kept ultra cold throughout their delivery.

And despite unprecedented public and private investment in vaccine development and procurement, Covax estimates it will need an additional $6.8 billion in 2021 to secure supplies for 92 developing nations.

Based on available sales figures, the authors said that rich nations representing 16% of the global population had already secured 70% of vaccine doses — enough to inoculate every one of their owns citizen several times over.

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“Securing large quantities of vaccines in this way amounts to countries placing widespread vaccination of their own populations ahead of the vaccination of health-care workers and high-risk populations in poorer countries,” said co-author Mark Jit from the London School of Hygiene and Tropical Medicine, AFP reported.

The letter called on manufacturers to accelerate technology transfer to developing nations to help them produce doses domestically, as well as price controls for what it termed “prohibitively expensive” vaccines currently on the market.

The authors opined that vaccines developed by China, India and Russia, once authorised by the World Health Organization, could be of big help to poorer nations as their supply and storage were simpler than the US/European alternatives.