Over-40s will be first in line from mid-April after the top nine priority groups receive one dose.
There was a 75% reduction in staff at Addenbrooke's Hospital testing positive after a vaccination.
Infection rates in the community are continuing to decline, says the Office for National Statistics.
Other groups have reported higher protection, but the results are still seen as a triumph.
A question everyone's asking: what's my Covid risk? Here's how to find out.
Borrowing - which hit a record £22.3bn in October - cannot go on indefinitely, chancellor says.