Half-dose nasal spray could supply world with Covid vaccine

Oxford scientist says method could be effective at reducing transmission

An Oxford trial is studying the efficacy of delivering the AstraZeneca Covid-19 vaccine as a nasal spray. Getty Images

A Covid vaccine delivered by nasal spray at half the usual dose could be effective at reducing transmission.

It has the potential to be particularly effective among young people by reducing levels of transmission by asymptomatic people, said Prof Adrian Hill, the director of the University of Oxford's Jenner Institute.

He said that a lower dose, if proved viable, could supply the world with vaccinations.

A nasal spray vaccine is being tested involving 30 healthy volunteers aged 18-40.

The test monitors the efficacy of the Oxford-AstraZeneca vaccine when delivered through the nose.

It will examine the level of immune system responses generated by the vaccine using this delivery technique, monitor safety and identify any adverse reactions.

The initial study will last about four months.

The Oxford-AstraZeneca drug is currently delivered by intramuscular injection as part of Britain's vaccination campaign.

People receive a doses of the BioNTech/Pfizer vaccine at a vaccination clinic set up inside the Derby Arena at Pride Park in Derby. AFP

A council worker clears up a disposable barbecue in Cannon Hill Park, Birmingham, after yesterday's warm weather and the easing of England's lockdown restrictions saw groups of people congregating in parks. Getty Images

Bins overflow with rubbish in Battersea Park in south London after yesterday's record breaking warm weather. Getty Images

A woman walks down a hill at Northala fields in London. AP Photo

A health worker administers a dose of the BioNTech/Pfizervaccine at a vaccination clinic inside the Derby Arena. AFP

People walk past a new mural of British veteran and fundraiser Captain Tom Moore by artist Akse P19 in Manchester. Reuters

Members of the public sit outside Winchester Cathedral in Winchester. AFP

People draw hearts on the National Covid Memorial Wall on the Embankment in central London. AP Photo

It is hoped that the nasal spray, which more precisely targets the site of infection, could enhance protection.

"We're excited about that because it might be more effective, particularly in young people, because young people often don't get unwell but they very often become asymptomatically infected and infect other people," Prof Hill told the i newspaper.

“If you put the vaccine in the nose, you get a mucosal response in the nose, with locally produced antibodies.

“That might be more effective in humans, because it is more effective in hamsters and in non-human primates in preventing local mucosal infection.

"More importantly, you might be able to halve the dose, which would be good if you're trying to supply the world, and we will be testing that."

A nasal spray also has the obvious advantage of avoiding needles, a reason why some people may be hesitant about getting vaccinated.

When the nasal spray study was announced, Dr Sandy Douglas, who is leading the study, said it was hoped it would lay the foundation for future larger studies that are needed to test whether giving the vaccine this way does protect against coronavirus infection.

“There are a variety of people who will find an intranasal delivery system more appealing, which may mean vaccine uptake is higher in those groups," she said.

“It might also have practical advantages – nasal sprays have been used successfully for other vaccines, for example, the flu vaccine used in UK schools.”

The AstraZeneca vaccine this year was embroiled in controversy over delivery rates in Europe, efficacy reports and side effects.

AstraZeneca renamed its Covid-19 vaccine in Europe as the pharmaceutical company struggles to reassure the public that the drug is safe.

The British-Swedish company said the drug would now be marketed under the new name Vaxzevria, although the product itself is unchanged.

The European medicines regulator approved the new name and updated its guidance to reflect the change.

The new look comes as Germany stopped general use of AstraZeneca's product in people aged under 60 because of a risk of blood clots.

Meanwhile, more than half of people (54.7 per cent) in England had coronavirus antibodies as of March 14, a new study by the UK's Office for National Statistics found.

Data suggested a clear pattern between vaccination and testing positive for Covid antibodies, the ONS said, more good news after England lifted some lockdown restrictions on Monday.

Life after lockdown: England's restrictions ease

A volunteer paints hearts on the wall along the embankment opposite parliament as part of the National Covid Memorial Wall in London. EPA

Members of the University of the Third Age iPhone photography group take advantage of the easing of lockdown and unseasonably warm weather to have an impromptu get together in Brighton. Getty Images

Rodney Hall, left, poses on his vintage Lambretta scooter after stopping at the beach with his friends and fellow members of the Breakfast Crew scooter club as they ride out for the first time in a group of six, in Bournemouth. AFP

A swimmer enters the water at the Hampstead Heath ponds in London. AFP

A girl stands amid blooming magnolia flowers at the Royal Botanic Gardens, Kew in London. Reuters

Paddleboarders take a rest as they sit on the boards in the sea in Bournemouth. AFP

Children play at an Easter festival inspired by Beano comics, at the Royal Botanic Gardens, Kew in London. Reuters

People enjoy the sunshine in St James Park, central London. AFP