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Caution over blood-clotting is sensible. Panic is not

We need to learn as much as possible about side effects from the AstraZeneca and Johnson & Johnson vaccines—while persisting with their mass use

By Philip Ball  

HD57medical / Alamy Stock Photo

The scare over blood-clotting as a potentially lethal side-effect of some of the Covid-19 vaccines has worsened with the announcement that it’s not just the AstraZeneca (AZ) vaccine that is implicated. Now the vaccine made by the pharmaceuticals giant Johnson & Johnson (J&J), which has become a central plank of the US vaccination programme, has been found to have the same complication—leading the US Centers for Disease Control and Prevention (CDC) and the Food and Drugs Administration (FDA) to recommend a temporary suspension of its use.

Because both vaccines are relatively cheap compared with others, such as those…

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