Serum Institute delay slowing UK vaccine rollout

Britain has been conducting the fastest roll-out of inoculations by a major economy but health officials said on Wednesday the program would face a significant reduction in supplies from March 29, without initially specifying where the problems were.

"We have a delay in a scheduled arrival from the Serum Institute of India," Hancock told lawmakers.

Britain is using vaccines made by Pfizer and AstraZeneca, with 10 million doses of the 100 million ordered from AstraZeneca coming from the Serum Institute.