Several Canadian provinces are restricting the use of Astra Zeneca vaccine due to blood clot issues. Some reports now say the problem odds are 1 in 55,000. Surely the UK should have good data on this by now. Also, those who had Astra Zeneca first doses can get mRNA vaccines for the second dose. This partly due to increased availability for the mRNA vaccines. Will be interesting to see the data on mixed doses as well as Canada’s increased dose interval period.
The UK does have good data. Interestingly, the risk of the AstraZeneca vaccine appears to be more or less the opposite of the danger of Covid-19: it's riskier for women than men, & riskier the younger you are. Maybe 2 out of every million people given it die. In the UK, about 2000 people out of every million of the entire population (not those who have been infected) have died of covid-19 so far. The incidence & death rate have plummeted recently, as the number of vaccinated people has grown. Up to yesterday, 68% of adults in the UK had had at least one dose of a vaccine, & 35% had received two doses. Over 95% of people over 50 have had at least one dose.
Given the availability of other vaccines & the contrary risk profiles of the vaccine & the disease, it makes sense to give other vaccines to relatively young people, especially young women, & save the AstraZeneca vaccine for older people. Refusing to use it at all is a luxury that only rich countries with plentiful vaccine supplies & high-grade infrastructure can indulge in, & would result in huge numbers of preventable deaths. The AstraZeneca vaccine is much easier to handle & a fraction of the price of the Pfizer & Moderna vaccines. They need very cold freezers, much colder than domestic ones. In much of the world it's hard to maintain a cold chain good enough for even the AstraZeneca vaccine, & damn near impossible for the mRNA vaccines.
Even in rich countries, being overly fussy about which vaccine to give can cause deaths. France has put a lower age limit (& a very conservative one) on the AZ vaccine, but people under that age are struggling to get vaccinated. There isn't enough of other vaccines to go round, & because of negative publicity, many people over the limit are refusing the AZ vaccine. Between 10 & 20 times as many people are currently dying of covid-19 in France as in the UK, & that's almost certainly because far fewer people have been vaccinated. The
daily covid-19 death rate in France is a few times what the British data suggest
total vaccine-related deaths would be if everyone eligible was given the AZ vaccine. But AZ vaccine is being thrown away because it's reached its expiry date before it can be given. Much the same in Germany.
BTW, official guidance for healthcare workers in the UK is freely available to everyone. It's on .gov.uk public pages, downloadable by anyone. Last updated yesterday.