Pfizer

Several vaccines are showing promise and one is already being reviewed by the UK regulator.

The Word Health Organization warns wealthier nations against buying up stocks of vaccines.

Who will be vaccinated first and when will that be? BBC Scotland takes a look at the government's vaccination plans.

The vaccine is cheaper than other options and easier to distribute around the world.

Hopes are rising that an effective vaccine against Covid-19 will be available soon.

US vaccine chief Moncef Slaoui says the vaccination programme could begin as soon as 11 December.

Experts say the pandemic needs a global solution, but there are concerns over access to vaccines.

The vaccine could get emergency authorisation in the first two weeks of December.

The jab works equally well in people of all ages and ethnicities, further data suggests.

A study suggests that one of China's vaccines shows a quick immune response.

The Dow hits a new record on hopes of a second coronavirus vaccine breakthrough from US drugs firm Moderna.

The results add to growing confidence that vaccination can end the pandemic.

Prof Ugur Sahin also raises hopes the vaccine, developed with Pfizer. could halve Covid transmission.

The full trial results have not yet been published, but scientists welcomed the positive news.

Preliminary results show a new vaccine is 90% effective in preventing people from contracting coronavirus.

The health secretary also announces that, from Tuesday, NHS staff will be tested twice a week.

The vaccine has to be kept at temperatures that are much lower than home freezers reach.