So far, so good: the Oxford university trials on a potential vaccine for Covid-19 is reported to be going well. It has been tested on more than a thousand people, and it looks to be safe. There is another, more important question, however, and one where an answer might take a frustratingly long time. Does it work?
It is too early to say. Right now, not enough of the people vaccinated have been exposed to the virus for any reliable results. Now the team are planning to move it into hospitals where the chances of exposure are significantly higher. The chances are that will give them more of an idea. But hold on. That’s crazy. In fact, what we need is a ‘challenge vaccine’.
In the United States, and elsewhere, there is already a campaign underway to change the rules on vaccine development.
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