Antibodies from a covid infection last at least 9 months
Almost all people who have recovered from Covid-19 have detectable levels of antibodies nine months later, according to a new study of almost the entire population of an Italian town, bolstering earlier research that suggests a prior infection conveys some protection against the coronavirus. Over a span of nine months, researchers from Italy’s University of Padua and Imperial College London tested more than 85% of the 3,000 residents of Vo, Italy, for Covid-19 antibodies. , found that 98.
There was no difference between people who had symptomatic and asymptomatic illness, the study found.this suggests that “the strength of the immune response does not depend on the symptoms and the severity of the infection.” For some people, antibody levels actually increased between testing, indicating a boost to the immune system from another infection with the virus.
The possibility of further infection could mean that people with antibodies—whether by infection or vaccination—are capable of transmitting the virus even if they are protected from disease, the researchers warned. Vo was the site of Italy’s first pandemic death and one of the first towns to be placed under strict lockdown during Italy’s initial Covid-19 outbreak.
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