The antibody test used in this research-an enzyme-linked immunosorbent assay (ELISA)-is based on the virus's telltale spike protein that contains the machinery that enables it to attach and gain entry into our cells.
The researchers calculated the reproduction "R" number of Covid-19 infections in England, which measures how many people an infected person will pass the disease to, is at 1.6, indicating the epidemic is growing.
The number of people who tested positive for antibodies fell by 26 per cent between June and September, a team at the Imperial College London found.
The study, which involved testing more than 85,000 volunteers, found 128 per 10,000 people were infected in England in the two weeks ending October 25, compared to 60 per 10,000 in the same period ending October 5. This suggests antibodies may decline more rapidly in those milder asymptomatic cases, compared to those presenting with more severe symptomatic infections.
"The idea is that while the natural infection may give you poor memory that may not last, the vaccine will give you strong memory that does last", said Danny Altmann, a professor of immunology at Imperial College London.
The Mount Sinai antibody test detects the presence or absence of antibodies to SARS-CoV-2 and, importantly, is capable of measuring the titer (level) of antibodies an individual has.
Oxford Covid-19 vaccine produces immune response across all ages - AstraZeneca
Asked if some people could receive a vaccine this year, he told the BBC: "I don't rule that out but that is not my central expectation".
"This very large study has shown that the proportion of people with detectable antibodies is falling over time", said Professor Helen Ward, one of the lead authors of the report. Findings were published ahead of peer review on Thursday.
The REACT study, an antibody surveillance study that tracks past Covid infections across England using home finger-prick tests, released its first set of data from 100,000 participants back in August, showing that just under 6 percent of those screened between June 20 and July 13 had antibodies.
A study conducted in the United Kingdom found that during the summer, antibodies against the novel coronavirus rapidly declined in the British population, a report by Reuters revealed.
Kroger Health announced Monday that rapid COVID-19 antibody tests are available at all pharmacies in MI. "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".
"Antibody responses are usually short-lived because once they have done their job you don't need them", said Jonathan Stoye, head of virology at Britain's Francis Crick Institute.
The study and university release included suggestions over declining immunity.