A third dose of Pfizer/BioNTech's Covid-19 vaccine was found to be 86 percent effective in people aged over 60, said an Israeli healthcare provider on Wednesday, citing initial results from a study.

Maccabi, a Health Maintenance Organisation (HMO) in Israel, which covers around a quarter of the country's 9.3 million population, compared results from 149,144 people aged over 60 who received their third dose at least a week ago with 675,630 who received only two doses, between January and February.

Some 37 people...