Combining AstraZeneca's Covid-19 vaccine with a second dose from either Pfizer-BioNTech or Moderna's jab provides "good protection", Denmark's State Serum Institute said on Monday.

A growing number of countries are looking at switching to different Covid-19 vaccines for second doses, a measure particularly necessary in Denmark after health authorities discontinued inoculations with AstraZeneca's vaccine in April over rare side-effect concerns...