Rush for results could lead to inferior Covid vaccine, say scientists – The Guardian

Scientists have warned that early adoption of a Covid vaccine with only moderate effectiveness could disrupt efforts to test and create improved versions. Immunising against the disease is not going to be a simple business of turning off the virus once the first vaccine appears, they say. In fact, there could be considerable confusion as researchers struggle to pinpoint the best versions for different vulnerable groups, such as the elderly.
The vaccines coming through fastest are the most experimental….

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