Covid vaccine: First '''milestone''' vaccine offers 90% protection - BBC News
It uses a completely experimental approach - that involves injecting part of the virus's genetic code - in order to train the immune system.
However there are logistical challenges, as the vaccine has to be kept in ultra-cold storage at below minus 80C.
There are also questions about how long immunity lasts, and about vaccine's effectiveness for different age groups.
Not quite offers 90% protection they won't know how long it lasts for.
It uses a completely experimental approach - that involves injecting part of the virus's genetic code - in order to train the immune system.
However there are logistical challenges, as the vaccine has to be kept in ultra-cold storage at below minus 80C.
There are also questions about how long immunity lasts, and about vaccine's effectiveness for different age groups.
Not quite offers 90% protection they won't know how long it lasts for.
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