People With COVID-19 Antibodies Are Protected for at Least 6 Months

Henrietta Strickland
November 22, 2020

The antibodies being studied are those created to bind to the "spike" of the Sars-CoV-2 virus which causes Covid-19 infections. Most of the adults had mild disease.

An earlier paper suggested just looking at antibodies might underestimate how many people were protected from re-infection by T cells - another part of the immune response. They found 91.1% of those who had recovered from COVID-19 had antibodies against the virus months after infection.

In the blood samples, the researchers examined components of immune memory. "The spike IgG titers were durable, with modest declines in titers at six to eight months". "B cell memory to some other infections has been observed to be long-lived, including 60+ years after smallpox vaccination, or 90+ years after infection with influenza", the authors said.

They also identified two types of T cells. "T cell memory might reach a more stable plateau, or slower decay phase, later than the first 6 months post-infection", the study states.

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.

The more antibodies people had, the lower their chances of re-infection. "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. The Wu family still runs the business but makes use of its partner to secure prime locations for its restaurants, particularly in Central, Hong Kong's main business district."[James Wu] played a key role in forging the successful partnership between Maxim's and Jardines almost five decades ago, which remains strong and flourishing to this day", said an obituary by Jardine Matheson and The Dairy Farm Group in the Post on Thursday."We will greatly miss Dr Wu as a business partner and as a friend, and we would like to express our condolences to his family."More from South China Morning Post: * Hong Kong caterer Maxim's told to stay clear of courts - and cockroaches * Maxim's founder S. T. Wu dies, aged 92This article James Wu, co-founder of Hong Kong's biggest restaurant group Maxim's, targeted during protests, dies aged 98 first appeared on South China Morning PostFor the latest news from the South China Morning Post download our mobile app.

"This ongoing study involving a large cohort of healthcare workers has shown that being infected with COVID-19 does offer protection against reinfection for most people for at least six months".

In the six months of follow up, nobody who had been infected previously was diagnosed with symptomatic Covid-19 for a second time compared with 89 people who had never had the disease.

However, up until now there have not been any large-scale studies of how much protection from reinfection people get after Covid-19.

Other reports by Click Lancashire

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