AstraZeneca, Pfizer vaccine antibody levels may decline after 2-3 months: Lancet study

According to a study in the journal, the total antibody levels start to wane six weeks after complete immunisation with Pfizer and AstraZeneca vaccines, and can reduce by more than 50% over 10 weeks. The findings support recommendations that adults who are clinically vulnerable, those aged 70 years or over, and all residents of care homes for older adults should be prioritised for booster dose

London: How safe are you from the coronavirus even when you are fully vaccinated? As the world is hoping for a vaccine resolution to the COVID-19 crisis, a Lancet study definitely brings little cheer. According to a study in the journal, the total antibody levels start to wane six weeks after complete immunisation with Pfizer and AstraZeneca vaccines, and can reduce by more than 50% over 10 weeks. The Oxford–AstraZeneca COVID-19 vaccine is sold under the brand name Covishield in India. India is in talks with suppliers to get Pfizer vaccine to the country. The researchers from University College London (UCL) in the UK noted that if the antibody levels carry on dropping at this rate, there are concerns that the protective effects of the vaccines may also begin to wear off, particularly against new variants. However, they said, how soon that might happen cannot be predicted yet.