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“Most long-term studies found that IgG waned over time (typically detectable up to at least a year) while others found detectable levels of IgG three years post symptoms onset.”
Coronavirus antibody immunity scientific paper14 Jun 2020 06:57
“A systematic review of antibody mediated immunity to coronaviruses: antibody kinetics, correlates of protection, and association of antibody responses with severity of disease“
“Key findings:
We have presented a broad, comprehensive review of multiple aspects of the literature on antibody immunity to coronaviruses. We identified a number of key findings. The median time to detection was similar across different antibodies for SARS-CoV-1 (12 days; IQR 8-15.2 days) and SARS-CoV-2 (11 days; IQR 7.25-14 days), but longer for MERS-CoV (16 days; IQR 13-19 days). Most long-term studies found that IgG waned over time (typically detectable up to at least a year) while others found detectable levels of IgG three years post symptoms onset. Antibody kinetics varied across the severity gradient with longer durations of detectable antibody associated with more severe symptoms. Human challenge studies with HCoV indicate that serum and mucosal immune responses (serum IgG, IgA, neutralizing titer, mucosal IgA) provide possible correlates of protection from infection and disease. However, repeat human challenge experiments with single HCoV suggest individuals can be infected with the same HCoV one year after first challenge, but with possible lower severity. There is cross-reactivity within but minimal reactivity between Alpha- and Beta-CoVs. While endemic HCoVs rarely induce cross-reactive antibodies against emerging HCoVs, SARS-CoV-1 and MERS-CoV stimulate antibodies induced by prior HCoV infections.”
https://www.medrxiv.org/content/10.1101/2020.04.14.20065771v1.full.pdf
Interesting little video report from the Indian Economic Times. .......
“Rapid antibody testing expanded: Is India looking at COVID-immune certificates?
The Indian Council of Medical Research has asked public and private hospitals, PSUs and other offices to conduct IgG antibody tests on employees to get them to work. The ICMR says such tests will help in removing the fear and anxiety of health care worders”
https://m.economictimes.com/industry/healthcare/biotech/rapid-antibody-testing-expanded-is-india-looking-at-covid-immune-certificates/videoshow/76571698.cms
You may get infected again but the time frame between nobody knows. It might be a year, 6 months or any other time frame. We’ve only been readers here this virus for months as it is, I know people in London that are getting free, multiple tests in different things as the research ramps up and they gather data
If people were getting reinfected then the media would be all over it and they’d be popping up all over the bbc news and sky and the papers saying they’ve had it twice. The media love a good sensational scare story and they all know it would be a major scoop if they can bring forward a case of a verified reinfection for the front page but they can’t find any.
Over 6.5 million recovered patients globally and the entire worlds media can’t find any twice infected patients for their front pages. None.
Dr faucici has said last night , people do not get reinfected and ill a second time . But they do not know how long antibodies last . Vaccines may last perhaps 6 months and you need a boost .
Given how dreadful covid can be , it makes me think there is a need to have a simple test after a vaccine to test whether one still has immunity . You can imagine everyone needing an antibody test after 6 months post vaccination .