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A single-dose Covid vaccine made by Janssen has been approved for use in the UK by the medicines regulator, BBC News reports.

The vaccine was 85% effective in stopping severe illness from Covid-19 in trials and has met expected safety standards.

Twenty million doses have been ordered for the UK and will arrive later this year.

It will be the fourth vaccine to be used in the UK to protect against Covid-19.

More than 38 million people have now received a first dose of a vaccine in the UK - nearly three-quarters of the adult population.

The vaccine can be given to people aged 18 and over and is likely to be used as a booster jab for care home residents ahead of winter because it can be easily stored and transported at fridge temperatures.

The UK's Joint Committee on Vaccination and Immunisation (JCVI) will produce advice on exactly who should receive the Belgian-made jab in due course.

The single-dose option has already been authorised by the European Medicines Agency (EMA), the Food and Drug Administration (FDA) in the US and the World Health Organization (WHO).

Nadhim Zahawi, vaccine deployment minister, said the Janssen jab would be "another weapon in our arsenal to beat this pandemic".

"We are doing everything we can to vaccinate all adults as quickly as possible and I encourage everybody to come forward for a jab as soon as they are eligible."