Being double-vaccinated offers the best protection against the Delta variant, first identified in India and now dominant in the UK, according to a new study.

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But people who have had both doses can still catch and transmit the disease, so researchers say it is essential as many people as possible get the jab.

Everyone aged 16 and over in the UK can now receive the Covid vaccine, and a third jab for the most vulnerable is being considered.

Those who are 16 and 17 are currently being offered a first vaccine dose and, as we've been reporting, more than 125,000 of them have done so in the past two weeks. But there is currently no timescale for when they could be given a second one.

The vaccine has already been approved for over-12s with underlying conditions or those who live with others at high risk, but there are no plans to give it routinely to this age group.

Millions of people most vulnerable to Covid-19 may be offered a third vaccination - along with the annual flu jab - from September, though the JCVI has not yet offered final guidance.