South Korean authorities said on Wednesday they are investigating the deaths of two people after a media report said the pair - both with pre-existing conditions - died within days of receiving AstraZeneca's Covid-19 vaccine.

A 63-year-old nursing home patient with cerebrovascular disease developed symptoms, including high fever, after being given the AstraZeneca vaccine, Yonhap news agency reported. The person was moved to a larger hospital on Tuesday, but died after showing symptoms of blood poisoning and pneumonia, Yonhap said.