The Delta variant will represent 90% of all Covid-19 cases in the European Union, the European Centre for Disease Control has said.

In a threat assessment, published today, the ECDC said that the variant is more transmissible than other variants and preliminary data shows it can also infect people who have received only one dose of vaccine.

The centre said that the Delta variant will very likely circulate extensively during the summer, particularly among younger people that are not targeted for vaccination.

The ECDC said the good news is that full vaccination provides high protection against the Delta variant and its consequences.

It said it is very important for countries to progress with vaccination roll-out at a very high pace.

The ECDC said it was crucial that the second vaccination dose is administered within the minimum authorised interval from the first dose, to speed up the rate at which vulnerable individuals are protected.

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It has warned about the risk for the more vulnerable individuals to be infected and experience severe illness and death if not fully vaccinated.

The ECDC has estimated that about 30% of people over 80 years and about 40% of people older than 60 years are not yet fully vaccinated in the EU.

Based on the current evidence, the ECDC said that the Delta variant, first detected in India, is 40-60% more transmissible than the Alpha variant, first detected in the UK, and may be associated with higher risk of hospitalisation.

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