Northerner
Admin (Retired)
- Relationship to Diabetes
- Type 1
On Wednesday Boris Johnson said he saw nothing in the current data to stop the planned lifting of Covid restrictions in England on 21 June. But he said questions remained over how much protection the current vaccines offered against the Delta variant, B.1.617.2.
If a Covid-19 vaccine is “90% effective” against symptomatic disease that means the risk of becoming ill is 90% lower among vaccinated people than among those who have not been vaccinated. For every 100 unvaccinated people who ended up with symptomatic Covid, for instance, only 10 would have been expected to have fallen ill had they received the jab.
www.theguardian.com
What does vaccine effectiveness mean?
Vaccine effectiveness is given as a percentage and refers to how well a vaccine works in the real world, as opposed to the term efficacy, which relates to vaccines’ performance in trials. The figures are often given with respect to symptomatic disease, although other outcomes, such as infection, hospitalisation or death, can be used.If a Covid-19 vaccine is “90% effective” against symptomatic disease that means the risk of becoming ill is 90% lower among vaccinated people than among those who have not been vaccinated. For every 100 unvaccinated people who ended up with symptomatic Covid, for instance, only 10 would have been expected to have fallen ill had they received the jab.
Covid variants: how much protection do the different vaccines offer?
While restrictions in England could lift soon, impact of Delta variant on vaccination programme is uncertain
www.theguardian.com
