Tuesday's government data release brings the total number of people in the United Kingdom to have died within 28 days of a positive Covid test to 45,365.
"We do not yet know if this will put these people at risk for the virus that causes COVID-19, but it is imperative that everyone continue to follow the guidelines to reduce the risk to themselves and others", said Ward.
Antibodies are a key part of the body's immune defences and stop viruses from getting inside the body's cells.
Those whose infection was confirmed with a gold standard PCR test had a less pronounced decline in antibodies, compared to people who had been asymptomatic and unaware of their original infection.
World Health Organization spokesman Tarik Jasarevic said that uncertainty over how long immunity would last, and the fact that most people had never had antibodies against the coronavirus in the first place, showed the need to break transmission chains.
Vergeire mentioned the drug earlier this month after a study showed that other off-label drugs, specifically hydroxychloroquine and lopinavir/ritonavir, tested against COVID-19 failed to treat patients.
The German researchers found the vast majority of people didn't have COVID-19 antibodies, even in hotspots for the disease, and that antibodies might fade in those who do.
According to the cross-sectional study involving a team of interdisciplinary experts from a consortium of five institutions, 90 percent of the study subjects were found to have detectable antibodies from 40 days up to seven months after being afflicted with the disease.
"Carbon monoxide is a highly toxic gas which can damage our lungs, resulting as a triggering factor for an increase in COVID-19 cases and deaths in the wildfire region", coauthor Sultan Ayoub Meo of King Saud University in Saudi Arabia told news agency Reuters.
"Our immune system recognizes the virus SARS-CoV-2 as harmful and produces antibodies in response to it, which helps to fight the virus", said study author Marc Veldhoen from Medicina Molecular Joao Lobo Antunes in Portugal.
"Regardless of the result of an antibody test, everyone must continue to follow government guidelines, including social distancing, self-isolation and conducting a test when you have symptoms and always remember hands, face, space".
A further 25 people have died after testing positive for the virus, bringing the total to 2,726. Health and care workers, ethnic minority groups, and those living in deprived areas and large households also had the greatest burden of past infection. However, researchers said vaccines could prove more powerful than natural immunity.
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