Covid vaccine effectiveness FALLS as low as 75% against Delta, study warns

COVID vaccines have lost some of their effectiveness as the Delta strain continues to dominate, a new study has warned.

Vaccines have been given out to millions of people across the world and help protect you from severe illness and death.

While no vaccine is 100 per cent effective, it was previously reported that in England, the vaccine programme has helped save 100,000 lives.

More than 48million Brits have had a first dose of the vaccine with 42.7million having had a second, and booster jabs are expected to be givento the most vulnerable in society in the coming months.

Data from the US now shows that vaccine effectiveness in preventing hospitalisations has fallen as low as 75 per cent against the Delta variant.

This is down from 95 per cent efficacy when the jabs first started to be rolled out in 2020, the US Centers for Disease Control and Prevention (CDC) said.

The data found that the Pfizer and Moderna jabs were still 95 per cent effective at preventing serious cases of Covid.

It found that people over the age of 75 were most at risk – with efficacy falling from 90 per cent to 80 per cent between June and July.

This could however be down to the time period between the first jab and now – which is one reason why the UK is keen to get booster jabs into the arms of the most vulnerable Brits.

The US is also preparing to roll out booster shots.

Sara Oliver, Epidemic Intelligence Service officer with the CDC's Division of Viral Diseases said: "Regardless of the vaccine evaluated, all vaccines remain effective in preventing hospitalisation and severe disease.

"But they may be less effective in preventing infection and mild illness recently.

"These reasons for lower effectiveness likely include both waning over time and the Delta variant", CNN reported.

It was previously reported that the Moderna vaccine was the most effective against the Delta strain which is thought to be more contagious that the Beta variant that had previously been the dominant strain.

Researchers in the US found that the Pfizer/BioNTech jab was just 42 per cent effective against the Delta strain.

The data was taken from July and the experts found that the Moderna jab trumped the Pfizer offering, with Moderna being 76 per cent effective against the Delta variant.

The study has not yet been peer-reviewed and was published in Medrxiv.

Jabs from Moderna and Pfizer have been rolled out in the US, while in the UK, jabs from Oxford/AstraZeneca have also been given out.

The Mayo Clinic researchers add: "Although clinical trials and real-world studies have affirmed the effectiveness and safety of the FDA (Food and Drugs Administration) – authorised Covid- 19 vaccines, reports of breakthrough infections and persistent emergence of new variants highlight the need to vigilantly monitor the effectiveness of these vaccines."

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