Not the most positive news for AZ.
Exclusive: Waning antibody levels are possible warning sign of lower protection in months after vaccination
www.theguardian.com
The UCL team analysed blood from 605 vaccinated people mostly in their 50s and 60s. They found that antibody levels varied widely between patients, but a double dose of Pfizer/BioNTech tended to produce far more antibodies against the coronavirus than two shots of the Oxford/AstraZeneca vaccine.
Three to six weeks after full vaccination with
Pfizer, antibody levels typically stood at about 7,500 units per millilitre (ml), but more than halved to
3,320 units per ml after 10 weeks.
For
AstraZeneca, antibody levels peaked at about 1,200 units per ml and typically fell to
190 units per ml after 10 weeks.
Since publishing the results in a
letter to the Lancet, the researchers have seen the same trend in a
further 4,500 participants in the study.