A friend, double-jagged with the AZ, became very, very, ill with Covid, a few months ago and was hospitalised twice, around 5 to 6 months after his second jag.
Today, we read of an Edinburgh University study based on 2 million in Scotland and 42 million in Brazil suggesting the level of protection waned after only 3 months.
Readers will remember problems with approval for the AZ in the EU and in the US.
Anecdotally, older friends who got the Pfizer, told me they had read worrying accounts of the AZ and were relieved to have got, to their minds, greater protection.
The key findings:
Researchers from Scotland and Brazil analysed data for two million people in Scotland and 42 million people in Brazil who had been vaccinated with the Oxford-Astra Zeneca vaccine.
In Scotland, when compared with two weeks after receiving a second dose, there was approximately a fivefold increase in the chance of being hospitalised or dying from Covid-19 nearly five months after being double vaccinated.
The decline in effectiveness begins to first appear at around three months, when the risk of hospitalisation and death is double that of two weeks after the second dose, experts say.
The risk increases threefold just short of four months after the second vaccine dose. Similar numbers were seen for Brazil.
Researchers were able to compare data between Scotland and Brazil as they had a similar interval between doses – 12 weeks – and initial prioritisation of who was vaccinated – people at highest risk of severe disease and healthcare workers.https://www.ed.ac.uk/usher/news-events/news-2021/vaccine-protection-wanes-after-three-months