Why Covid-19 vaccines face a new obstacle course

A researcher working in a lab run by Moderna, which says its experimental vaccine is 94.5 per cent effective in preventing Covid-19 based on interim data from a late-stage trial. A vaccine is one of the world's most complex products to produce, says
A researcher working in a lab run by Moderna, which says its experimental vaccine is 94.5 per cent effective in preventing Covid-19 based on interim data from a late-stage trial. A vaccine is one of the world's most complex products to produce, says the writer, and the process of scaling up from tens of thousands of doses for a trial to hundreds of millions for mass vaccination is not trivial.PHOTO: REUTERS

The race to find an effective vaccine appears to be on the home straight. The same cannot be said of the race to roll it out everywhere.

Preparing to present a BBC radio series titled How To Vaccinate The World, I've been looking at the route ahead. It is less of a marathon, more of an assault course.

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A version of this article appeared in the print edition of The Sunday Times on November 22, 2020, with the headline 'Why Covid-19 vaccines face a new obstacle course'. Subscribe