Less than a month into a Covid-19 vaccine booster drive, Israel is seeing signs of an impact on the country's high infection and severe illness rates fuelled by the fast-spreading Delta variant, officials and scientists say.

On July 30, it began administering a third dose of the Pfizer/BioNtech vaccine to people over 60, the first country to do so. Israel then expanded eligibility to 40-year-olds and up whose second dose was given at least five months prior, saying the age may drop further.

In the past 10 days, the pandemic is abating among the first age group, more than a million of whom have received a third vaccine dose, according to Israeli health ministry data and scientists interviewed by Reuters.

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