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From our analysis, we found the following most relevant:Antibody titres refer to the presence, and amount, of antibodies within a person's blood.
The research calls into question how much protection individuals who have had the coronavirus have from subsequent reinfection, and the durability of any potential vaccine.
World Health Organization officials said Monday that patients who recover from Covid-19 may be able to get the coronavirus again, citing similar studies that suggest immunity may wane after a few months.
Dr. Maria Van Kerkhove, head of the WHO's emerging diseases unit, said patients "do mount some level of an immune response."
Speaking at a news conference at the organization's Geneva headquarters, she added that, "what we don't know is how strong that protection is and for how long that protection will last."
"So there are a number of studies under way that are trying to answer these questions," she said.
A peer-reviewed study published in the Lancet medical journal last week claimed that Covid-19 antibodies in Spain's population were "insufficient to provide herd immunity," which refers to when a population is allowed some exposure to the virus in order to build immunity among the general population