India Covid variant may increase risk of hospital admission, early data suggests

Public Health England analysis finds Delta variant is more likely to lead to hospitalisation than Kent variant

The coronavirus variant of concern first discovered in India, known as Delta, is more likely to lead to hospitalisations than the Alpha variant first detected in Kent, data suggests, raising further concerns about its spread across the UK.

The Delta variant, also known as B.1.617.2, is the dominant variant in the UK – accounting for up to 75% of new coronavirus cases. It is believed to be more transmissible than the Alpha variant, and somewhat more resistant to Covid vaccines, particularly after just one dose.

Now a report from Public Health England has not only revealed that confirmed cases of the variant in the UK have risen to 12,431, up from 6,959 the week before, but that it appears to be linked to an increased risk of hospitalisation compared with the Alpha variant.

An analysis of 38,805 sequenced cases in England revealed that the Delta variant was associated with a 2.61 times higher risk of hospitalisation within 14 days of specimen date than the Alpha variant. There was a 1.67 times higher risk of A&E care within 14 days. These figures take into account factors such as age, sex, ethnicity, area of residence and vaccination status.

Data from Scotland supported the findings, also pointing to a more than twofold higher risk of hospitalisation for those infected with the Delta variant compared with the Alpha variant.

“Confirmatory analyses are required to confirm the magnitude of the change in risk and to explore the link to vaccination in more detail,” the document stated.

Prof Adam Finn of the University of Bristol and a member of the Joint Committee on Vaccination and Immunisation said: “Although only a small number of cases end up in hospital, the proportion is about twice as high for Delta cases than Alpha cases in both England and Scotland.” he said. “The number of cases is still small, but if this trend continues and case numbers continue to rise quickly, that would point to a larger number of people being seriously affected as this variant continues to replace the alpha variant over coming weeks.”

Meaghan Kall, an epidemiologist at PHE tweeted that the growth rate for the Delta variant remains similar to the week before, and that its prevalence is rising in all regions of the UK.

“One shining light however is that vaccination still appears to be making an impact on spread,” she said, noting 73% of Delta cases are in unvaccinated people and only 3.7% Delta cases are in people who’ve had both doses, while only 5% of people hospitalised with this variant have had both jabs.

Dr Jenny Harries, chief executive, UK Health Security Agency, stressed the importance of Covid jabs. If you are eligible and have not already done so, please come forward to be vaccinated and make sure you get your second jab. It will save lives,” she said.

The PHE report came as research published in the Lancet by scientists at the Francis Crick Institute and the National Institute for Health Research, added to the evidence that Covid jabs are somewhat less effective against the Delta than the Alpha variant, particularly after the first dose.

The study, which involved analysis of blood samples from 250 healthy people who received either one or two shots of the Pfizer/BioNTech jab, showed that levels of neutralising antibodies that can tackle the Delta variant are, on average, lower than those that can tackle the original strain of the virus or the Alpha variant – although levels of neutralising antibodies against each variant were higher after two jabs than one.

The data comes as overall Covid cases in the UK continue to rise: on Thursday 5,274 new cases were reported, up from 4,330 the day before.

Hospitalisations are also showing signs of an uptick in some parts of the country, highlighting that while the link between infections and severe disease has been weakened by the vaccination programme it has not been severed.

Prof Christina Pagel, director of UCL’s Clinical Operational Research Unit, said the new PHE report is concerning. “Every technical report seems to bring worse news. Added to increased transmissibility and some vaccine escape, we now have evidence that your chance of being hospitalised might be twice as high with the Delta variant than with the Alpha variant,” she said. “This makes it harder for vaccines to weaken the link between cases and hospitalisations.”

Prof Danny Altmann at Imperial College, London, agreed. “This just adds to our ongoing concerns about the currently growing impact of the Delta variant. We knew it was more transmissible than our previously most concerning Alpha variant and has rapidly been replacing it as the dominant strain. We also know that it has more profound immune evasion and poses an enhanced threat particularly to all who have so far received no vaccine or only one dose. To this we now add a further concern that those infected may have a raised chance of progressing to hospitalisation,” he said. “This is not where we wanted to be.”

Deenan Pillay, professor of virology at UCL and member of the Independent Sage group of experts, suggested the data threw further doubt on the easing of restrictions later this month.

“These are the sorts of data which make it more difficult to carry on with the roadmap as planned. This is the first time we’ve had a hint that the variant is associated with a greater risk of hospitalisation,” he said.

“If a virus is more transmissible, a key driver can be a higher amount of viral replication and what goes along with that is more severe disease. That’s still to be confirmed but it may be one explanation for what we are seeing.”

Pillay added that it is important that rules are adhered to despite the feeling that we are coming out of lockdown.

“There should be no laxity of protective measures like social distancing and the rest of it. Infections are rising and it’s essential people know the risks,” he said.


Nicola Davis and Ian Sample

The GuardianTramp

Related Content

Article image
Cut to self-isolation period may increase Covid hospital risk, says NHS chief
Pressure is on government to cut time to five days in England, but experts say this may lead to rise in community

Nicola Davis and Rob Davies

30, Dec, 2021 @2:27 PM

Article image
Hospital incursions by Covid deniers putting lives at risk, say health leaders
Healthcare and police chiefs also say online activity is channelling hatred against NHS staff

Ben Quinn and Denis Campbell

27, Jan, 2021 @3:49 PM

Article image
India Covid variant spreading in England’s schools, data shows
Public Health England figures show the number of Delta variant infections in schools and colleges rose sharply in May

Richard Adams and Nicola Davis

03, Jun, 2021 @8:05 PM

Article image
Liverpool Covid admissions will 'devastate' other hospital care
Non-urgent operations at risk unless infection and admission rates fall, top doctor says

Denis Campbell Health policy editor

15, Oct, 2020 @11:25 AM

Article image
Lockdown hobbies led to thousands of injuries in England, NHS data suggests
Hospital admissions figures show extent of accidents as people turned to cooking, DIY and other pursuits

Jessica Murray

03, Jan, 2022 @6:00 AM

Article image
NHS hospital bosses urge ministers to increase ICU beds in England
Expansion of capacity must be lasting legacy of Covid-19, says NHS Providers chief executive

Denis Campbell Health policy editor

28, Feb, 2021 @7:00 PM

Article image
Final-year medical students graduate early to fight Covid-19
In some cases exams cancelled as universities free up new graduates to work in hospitals

Haroon Siddique

20, Mar, 2020 @3:10 PM

Article image
Up to 20% of hospital patients with Covid-19 caught it at hospital
NHS England figures reveal some infections were passed on by hospital staff unaware they had virus

Luke Harding and Denis Campbell

17, May, 2020 @2:16 PM

Article image
Quarter of Covid hospital admissions in England aged under 55
NHS boss Sir Simon Stevens reveals figure as he tells MPs the virus is spreading out of control

Rajeev Syal

11, Jan, 2021 @7:27 PM

Article image
NHS to increase number of Covid-19 patients receiving antibody therapy
All hospital patients with coronavirus in England to be eligible for convalescent plasma

Ian Sample Science editor

28, May, 2020 @1:07 PM