COVID-19: Prior coronavirus infection 'offers protection for at least six months'

Study: Coronavirus immunity can last up to 8 months

Earlier in the week, a study conducted by Public Health England looked at T-cells - another element of our immune systems' response to infection.

The results were "consistent with Sars-CoV-2 re-exposure that did not lead to repeat symptoms", the study said.

"We will continue to follow this cohort of staff carefully to see how long protection lasts and whether previous infection affects the severity of infection if people do get infected again", Eyre said. It comes after a much larger study by Imperial College found that antibodies declined by about 25 per cent three months after infection.

Because TNF-alpha and IFN-gamma are produced during Covid-19 and cause inflammatory cell death, the investigators questioned whether these cytokines were responsible for the clinical manifestations and deadly effects of the disease. The researchers said there appeared to be an increase in memory B cells over time. "T cell memory might reach a more stable plateau, or slower decay phase, later than the first 6 months post-infection", the study states.

The findings should offer some reassurance for the more than 51 million people worldwide who have been infected with the pandemic disease, researchers at the University of Oxford said. The study, published November 19 in the Journal of Experimental Medicine (JEM), also suggests that in addition to blocking SARS-CoV-2's entry into cells, the antibodies may combat the virus by enlisting various types of white blood cells to fight the infection.

In a statement to United Kingdom based Science Media Centre, Stephen Evans, Professor of Pharmacoepidemiology, London School of Hygiene & Tropical Medicine, said that there are two major consequences if the findings are as they say.

If the same is true with Covid, then a second infection would be milder than the first. "This means that the population level of immunity may be rising which will eventually lead to reduced transmission", Evan said adding that this, coupled with immunity being conferred by vaccination, offers prospects of transmission of the virus being markedly reduced over the next year or so.

It is also good news for immunisation programmes, because if the body can provoke a long-term immune response naturally, it should also do so when triggered by a vaccine.

Previously it was feared antibodies wane after just a couple of months but a number of recent studies have shown both T-cells and antibodies last for at least six months, meaning those who have recovered from an infection are protected for at least that amount of time.

Pairs of antibodies may be more effective than single antibodies at preventing and treating COVID-19, according to a new study by researchers at the University of North Carolina at Chapel Hill and The Rockefeller University in NY.



Latest news

76ers trading Josh Richardson to Mavericks
The Sixers have been aggressive in trying to rework their roster after getting swept in the first round of last year's playoffs. Dallas is acquiring Philadelphia's Josh Richardson and No. 36 pick for Seth Curry , source tells ESPN.

Ontario to get 2.4 million COVID-19 vaccines in early 2021: Elliott
Pfizer and BioNTech announced a positive development in their latest findings from their COVID-19 vaccine candidate, BNT162b2. By triggering production of the spike protein, the vaccine teaches the immune system to be on the lookout for the virus.

Meghan Markle will ‘never dare come back to London
She claims that she did not cut ties with Thomas , but only convinced him to stop communicating with the press - but he did not heed her requests.

Why is GTA 6 trending? Rockstar confuses everyone with announcements
It is, presumably, new content for Grand Theft Auto Online , but how John Doe and El Rubio will factor in is unknown. It takes place on the private island of a drug kingpin, and you're headed to his home to soak up the sun.

Contestant dies after completing "Wipeout" obstacle course
Production was paused Thursday and Friday, and the show was heading into a preplanned week off for the Thanksgiving holiday. As of this writing, there's no word yet on how this will affect future episodes of the show as it's now in production.

Other news