The research, commissioned by the British government, indicates people's immune response to COVID-19 reduces over time following infection. The findings also noted that samples from hundreds of thousands of people across England between mid-June and late September revealed that the prevalence of antibodies in people fell by more than a quarter.
Some scientists believe the part played by T cells - a type of white blood cell that helps the immune system fight viruses and which is linked with prior infections with common colds - may be more crucial in fighting the virus.
The study involved 365,000 randomly-selected adults administering at home three rounds of finger prick tests for coronavirus antibodies between June 20 and September 28.
Those aged 18-24 had the highest prevalence of antibodies and lowest decline in antibody levels at 14.9 percent.
Researchers stressed that it was not yet known what level of antibody response was required to protect against reinfection, meaning it was possible that even low levels of antibodies offered some protection. That raises the prospect of decreasing population immunity ahead of a second wave of infections that has forced local lockdowns and restrictions in recent weeks.
Researchers yesterday said the findings showed Britain was "a long long way" from anything approaching natural herd immunity.
Asked about herd immunity, Helen Ward, professor of public health at Imperial College London, said: "Even at best, (in the first round of the study) 94 per cent of the population remained not likely protected, and now that has declined to over 95 per cent of the population who don't have evidence of antibodies".
The study found that antibody levels fell by 26.5 percent overall during the three-month period. The study is yet another confirmation on studies which suggest that protection after COVID-19 infection may not be long-lasting.
"We don't yet know whether this will leave these people at risk of reinfection with the virus that causes COVID-19, but it is essential that everyone continues to follow guidance to reduce the risk to themselves and others".
"So I think we are a long, long way from any idea that the population will be protected by other people".
She added: "These data should not be taken to infer that a vaccine would only induce short-term immunity".
Graham Cooke, professor of infectious diseases at Imperial College London, said: "The big picture here is that after the first wave (of coronavirus), the great majority of the country still did not have evidence of protective immunity".
The decline in people testing positive for antibodies was largest in those who did not report having had Covid-19, compared to those who said they previously tested positive for the virus.
"So the need for a vaccine is still very large if you want to try and get a large level of protection in the population".
MMA star Khabib Nurmagomedov, right, lands a punch on Justin Gaethje during their lightweight title fight at UFC 254. It turns out there was a reason why Khabib Nurmagomedov opted to use a triangle choke to submit Justin Gaethje .
Manchester City have paid tribute to former academy player Jeremy Wisten following his death at the age of 17. The cause of death is now unknown and Wisten's family are yet to comment. 1737, Need to talk?
La part du réseau Leroy Merlin sur le marché russe de "l'équipement ménager" approche les 20%. Beaucoup d'entre eux se plaignent des manifestations de corruption et des violations de l'éthique des affaires.
If the weather is warm enough, treats can also be handed out from the driveway or front lawn to allow for more space and distance. Indoors and outdoors, you are more likely to get or spread COVID-19 when you are in close contact with others for a long time.
KYR information reported this week that Trump Jr. and his siblings may give their father an edge on Fb and different platforms. He has also cultivated a cult following on social media, with his Twitter retorts even more abrasive than his father's.
En effet, avoir mille et une tâches à accomplir à la fois, ça peut avoir des effets négatifs. En effet, les travailleurs effectuent les tâches beaucoup plus rapidement tout en conservant leur qualité de vie.
Mayor Jim Kenney said he watched a video of the incident and that "it presents hard questions that must be answered". The line of officers stretched between 53rd and 55th streets on Pine Street, leaving protesters trapped.
Un dispositif enrichi d'une offre numérique sur le site L'Équipe , qui diffusera un match supplémentaire chaque samedi soir. Les basketteurs sarthois se déplaceront dans les Pyrénées-Atlantiques où ils affronteront l'équipe de Pau-Lacq-Orthez.
A Cardiff Tesco store blocked sanitary items from being sold
He said items "that other high street shops which are now closed can't sell at the moment" won't be available in supermarkets . Mr Gething said he recognised the ban on selling non-essential items was "difficult" and "hard for people to accept".
Over 42k people enrolled in Pfizer's COVID-19 vaccine trial
Earlier this month, Dr al-Khal said Qatar signed an agreement with Pfizer and BioNTech to supply Qatar with their vaccines. AstraZeneca said that it was encouraging to see the immune responses were similar between both older and younger adults.
Fils de légende de la Formule 1 a dépassé son père
Nul doute qu’elle offrira à Mika la meilleure option pour poursuivre sa carrière dans le sport automobile. Et il n'est pas Andrei Arshavin, pour répondre à la question sur les attentes facilement et naturellement.