Pfizer COVID-19 vaccine 'very promising' but cold chain issues: WHO

[perugu_vada]

The World Health Organization’s (WHO) chief said on Tuesday it hopes to have a COVID-19 vaccine by year-end and that Pfizer’s experimental remedy is “a very promising one”, with more expected.

But the vaccine, based on a novel technology that uses synthetic mRNA to activate the immune system against the virus, comes with special challenges as it needs to be stored at minus 70 degrees Celsius (-94 F) or below - equivalent to an Antarctic winter.

[PilliBeta]

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[MiryalgudaMaruthiRao]

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