The research, not yet peer-reviewed, has also shown that while two doses of the Pfizer vaccine are initially more effective, four to five months after the second dose, it is the same as the AstraZeneca vaccine.
The team studied 384,543 people who became infected between December and May, when the alpha variant was dominant, before comparing them to 358,983 people infected between May and August, when delta took over.
Professor Walker said that while the jabs didn’t stop transmission, they would likely prevent hospitalization and death.
“There are many reasons why vaccines can be very effective in reducing the consequences of having the virus,” she added. “You might just have a milder infection and not end up in hospital.
“While the results are important, they don’t do everything and it’s really important to remember that vaccines are super effective in preventing hospitalizations. “
Professor Paul Hunter, professor of medicine at the University of East Anglia, said: “We now know that vaccination will not stop infection and transmission, although it will reduce the risk.
“The main value of vaccination is reducing the risk of serious illness and death. The available evidence shows that protection lasts longer against serious illnesses than against mild illnesses, and all current UK vaccines are very effective at this, even against the delta variant. For me, this is the most important value of vaccinations. ”