HuffPost UK reader Sue asked whether there's a test for the level of immunity after having the coronavirus jab. Here's what experts say.
HuffPost UK reader Lisa asked why people who have had Covid-19 are being told to get vaccinated.
A new study shows 88% of people retain antibodies for longer than previously thought.
Many countries are considering passes as a way to allow people who have recovered from Covid-19 to work and move about freely.
We don't know how, or when, the coronavirus crisis will come to an end – but here are some of the breakthroughs we've seen over the past week.