>> The first shot alone is apparently (broadly) 50% effective. The second makes it (broadly) 90%
>> effective, say Pfizer.
>>
I am sure I have said this before, but may I recommend BBC Radio 4 'More or Less'. 'How effective is one dose of the vaccine'.
It is good listening at any time, but perhaps, especially now.
www.bbc.co.uk/programmes/b006qshd
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