COVID-19 immunity can last more than six months

Elias Hubbard
November 21, 2020

The findings are consistent with a similar study that showed immunity in people for at least three months and another that showed immunity in people even when antibodies weren't detectable.

'We found no new symptomatic infections in any of the participants who had tested positive for antibodies, while 89 of those who had tested negative did contract the virus.

The research, published online, has not been peer-reviewed nor published in a scientific journal.

These "memory" cells are crucial.

They also said despite the outbreak, the medical assessment unit and injury unit, scheduled care services & out patients services still remain open and unaffected.

But many immunologists have noted that it is natural for antibody levels to drop.

"Notably, memory B cells specific for spike or RBD were detected in nearly all COVID-19 cases, with no apparent half-life at 5+ months post-infection".

Evidence is beginning to suggest that antibodies disappear in as little as eight weeks after infection with the coronavirus, scientifically called SARS-Cov-2.

The funding from the Department for Health and Social Care Testing Innovation Fund will help to facilitate the genome sequencing capacity needed to meet the increasing numbers of COVID-19 cases expected in the United Kingdom this winter, by allowing the team to expand whole-genome sequencing of positive SARS-CoV-2 virus samples.

In the study, researchers from La Jolla Institute for Immunology in the USA analysed multiple types of immune cells in 185 Covid-19 patients, including 41 cases who had recovered from the infection in over six months before the study.

American researchers from the Jolla Institute for Immunology (California) have just published the most complete study conducted on immunity to Covid-19. Most of the adults had mild disease.

T cells - which can't be detected by the "have you had it" antibody tests - made in response to the infection may offer a form of immunity that lasts several times longer.

The virus could thus be "terminated fast enough that not only are you not experiencing any symptoms, but you are not infectious", added Dr Alessandro Sette, an immunologist and co-author of the study.

However, there are also many asymptomatic people who do not know that they are infected.

Remember: The study does have some limitations, including the fact that they suspect that the delirium rate observed is an underestimate, they were unable to evaluate site-specific data and enrollment occurred primarily in the Northeast during a time when it was undergoing a surge in COVID-19 infections.

"The duration of immunity is unclear, but it does make sense that we may start seeing cases of reinfection with the novel coronavirus, as with other common coronavirus infections", he said.

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