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India rolled out the third phase of its COVID-19 vaccination drive for those in the age group of 18-45 years on Saturday.

A million doses from the institute, which had already been delivered, have been sold on to other countries in the African Union.

According to the WHO's statistics, as of Wednesday, at least 2.6 million people have died of Covid-19 worldwide.

Vaccine hesitant people may have anxiety over safety concerns, or they might belong to a community that historically has mistrusted the medical establishment, according to the study.

Investigators said the vaccine was effective across all ages, including older people — which previous studies in other countries had failed to establish.

In a statement on Friday, the WHO said that based on available data the review team found no increased risk of blood clotting conditions in people who received the AstraZeneca-Oxford vaccine.

Germany, France, Italy and Spain were among countries that suspended use of the vaccine on Monday.

Thailand last week was the first country outside Europe to temporarily suspend using the AstraZeneca vaccine.

"Safety is of paramount importance and the Company is continually monitoring the safety of its vaccine," the company said in a statement on Sunday.