50% with the first jab of the Pfizer as we are receiving it in two parts.
Indeed I remember Pfizer saying their testing indicated 57%.
"Professor David Salisbury, in charge of immunization programs at the
Department of Health until 2013, is quoted as saying, “If you look at the New England Journal of Medicine paper about the Pfizer vaccine..you give one dose and you get 91 per cent protection, you give two doses and you get 95 per cent."
The NEJM paper actually states that the efficacy between the first and second doses was found to be 52 percent when given 21 days apart. After the second dose, the efficacy raises to 95 percent."
.
Trouble is nobody is quite sure what 90% efficy means and apparently the two trials on AZ and Biontech utilised different criteria.
From what I understand even 90% efficy doesn't mean 90% don't become infected.
From our point of view the important issues must be. A)death b) hospitalisationC) serious disease.
It seems none of the vaccines actually prevent infection but do prevent illness developing. Suspect its why nobody is sure whether vaccination will prevent spread... But you would guess if severe infection is prevented viral dose will be reduced and hence, you, d guess, less chance of spreading.
Listening to Oxford rep on R4 last week she assured listeners even tho efficy rates appear lower (for AZ) that even after only a single dose nobody was hospitalised and nobody had serious disease 3 weeks after single dose. (she also said time between doses on AZ was always 12 weeks, which was news to me, I, d thought that was 3 weeks as with Biontech)
As far as I, m concerned no deaths, no serious disease is 100% efficy.???
I, ve never found anyone willing to disclose the exact criteria when discussing efficy.
Let's face it even Ice cream can test positive for covid I, m pretty sure no vaccine could stop you testing positive at some time or another.
Ps
4 million plus single doses administered.
425,000 have had 2 doses.