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People who receive the Pfizer or AstraZeneca COVID-19 vaccine have antibody levels significantly higher than those infected with the SARS-CoV-2 virus, according to a study published in Scientific Reports journal on Monday. A team led by researchers at the University of Montreal in Canada found that these antibodies were also effective against the Delta variant.
In the study, 32 non-hospitalised COVID-19 positive Canadian adults were recruited 14 to 21 days after being diagnosed through PCR testing in 2020, before the Beta, Delta and Gamma variants emerged. “Everyone who had been infected produced antibodies, but older people produced more than adults under 50 years of age,” said Jean-Francois Masson, a professor at the University of Montreal.
“In addition, antibodies were still present in their bloodstream 16 weeks after their diagnosis,” Masson said. Antibodies produced after an infection by the original viral strain also reacted to SARS-CoV-2 variants that emerged in subsequent waves, namely Beta, Delta and Gamma, with a reduction of 30 to 50 per cent in reactivity.
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